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nasa · 2 years

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Astrobiology: The Story of our Search for Life in the Universe

Astrobiologists study the origin, evolution, and distribution of life in the universe. This includes identifying evidence left behind by life that once survived on the ancient Earth, and extends to the search for life beyond our planet.

When looking for signs of life on other worlds, what are they looking for?

Things called biosignatures. For example, when you sign a piece of paper, your signature is evidence of your existence. Similarly, biosignatures are anything that can prove that life was once, or is, present in an environment.

If we were very very lucky, we might spot something we know is life with a powerful telescope or receive a "phone call" or radio signal from alien civilizations. Those types of biosignatures would be obvious. But they would only let us identify advanced life.

For most of Earth’s history (billions of years), single-celled life like bacteria and archaea have been around. Humans have only been making radio transmissions for hundreds of years. So we have a better chance of finding life if we look for signs that have been around for very long periods of time.

Patterns in ancient rocks that were created by life are a great example. That can be anything like a dinosaur footprint or structures built by microorganisms, like stromatolites.

Molecules can also be biosignatures, like DNA left behind for detectives to discover. But DNA doesn’t last very long on its own in most environments, so other molecules like lipids (like natural oils, wax, and fat) might be a better choice if you are looking for signatures of life from millions (or billions) of years ago.

Even the balance of gases in a planet’s atmosphere can be a sign of past or present life. On Earth, biology plays a major role in maintaining the delicate composition of gases like nitrogen, oxygen, and carbon dioxide in the air that we breathe.

These are just a few examples of signs astrobiologists look for when searching for life amongst the stars! Research into these biosignatures inform many of our biggest missions, from observatories like the Hubble Space Telescope and the Webb Space Telescope to our Mars Sample Return endeavor.

Want to learn more about the search for life? Check out the latest issue of our comic-book style graphic history novel, Astrobiology: The Story of our Search for Life in the Universe. This new chapter is all about biosignatures.

Explore life in the universe with us by following NASA Astrobiology on Twitter and Facebook.

Make sure to follow us on Tumblr for your regular dose of space!

#Artists on Tumblr #NASA #space #science #life #explore #comic #comic book #artwork #history #illustrations #illustrators on tumblr #universe #are we alone?

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wiisagi-maiingan · 6 months

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You are allowed to exist alone in public btw. You're allowed to go to the movies alone and go out to eat alone and hang out in a park alone and go for a walk alone and whatever else. It isn't weird or creepy, it doesn't make you lonely or a loser or whatever. You are allowed to just exist as yourself.

#this was prompted by the trend of taking videos and photos of people who are alone in public #especially when they're in restaurants #like i'm sorry but maybe some of us just like our solitude #and we still deserve to exist in public without some asshole taking videos of us to post on tiktok

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waking-hell · 2 months

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tumblr is literally about talking to yourself through text posts or tags and once in a while people get nosy

#jk guys i love y'all #relatable shit is what reminds us we are not alone #txt

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akanemnon · 11 days

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Turns out this new Dark World is paid DLC

FIRST - PREVIOUS - NEXT

MASTERPOST (for the full series / FAQ / reference sheets)

Heads up: By the time this comic is published I will be on a trip to visit my partner in the US. Asks will stay closed for the time being! I will officially be back on April 28.

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fumifooms · 26 days

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Thistle struggling to reconcile Mithrun saying Delgal’s dead with the illusion he’s been living, cracks forming on memories of a time Delgal refused soup from him.

Thistle in "Delgal’s" arms, refusing soup because he no longer feels needs.

Eating is the privilege of the living

We were supposed to have dinner together

#dungeon meshi #Delicious in dungeon #thistle #delgal #meta #dunmeshi parallels you are famous to me #Spoilers #dungeon meshi manga spoilers #@SOAP YOUR BRAIN #The progression from Delgal sharing an apple with him to Delgal drinking alone…#Dinner table motif you are famous to meeeee #Eating is the privilege of the living and we were supposed to have dinner together

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ratboy · 1 year

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I love u tboys I love u trans men I love u transmasc nb ppl I love u transmascs who can't or don't want to take HRT I love u ass hair I love u hairy arms and legs I love u wispy mustaches and beards I love u fat transmasc bodies I love u "tboy voices" I love u receding hairlines I love u transmascs who pass for cis I love u transmascs who won't ever pass I love u top surgery scars I love u transmasc chests I love u no-op, pre-op, and post-op transmascs I love u transmascs!!!!!!!!!!!!!

#transmasculine positivity #transmasc positivity #trans men #ftm #this post is for the fellow tboys and tmen who are out here being little weirdos and fruits #truscum will be shot on site #we are not alone and we will not be silenced 💛💛💛#nonbinary #transmasc nonbinary #queer #transgender #caws #trans rights now #trans liberation now

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phantom-of-the-keurig · 2 months

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During his intel briefing I hope Crosshair casually mentioned teaming up with Cody before he went AWOL so Rex can find out and be like

#he’s been out there this whole time??? ALONE????#brother we have to find him rn. cody isn’t made for the streets.#tbb spoilers #tbb crosshair #commander cody #captain rex

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jonnywaistcoat · 11 days

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Mr. Waistcoat, there's a rather heated discussion about this question on hellsites such as Twitter & Tiktok, and I thought your opinion might be a valuable contribution.

Would you rather stumble across a bear or a man when alone in the woods?

Wish you a lovely day (preferably not alone in the woods),

drumla

This is a very bizarre question that I can only put down to the likelihood that the majority of Twitter/Tiktok users don't regularly go walking alone in the woods, 'cause, uh, you do meet people (including men), pretty regularly. And it's fine. Maybe you say hi or give each other a nod as you pass, but basically no-one is actually lurking in the woods with sinister intent. When you meet someone, chances are they are also just taking a walk. It's not impossible the encounter might be unpleasant, I suppose, but it's a pretty tiny possibility.

A bear, on the other hand... Depending on the type of bear, that's an encounter that has a comparatively high chance of going sideways.

I suppose my view might be slightly skewed by being a British man - passing other people in the woods generally only requires a nod of acknowledgement, whereas in a lot of other cultures (especially much of the US) I suspect the expectation of being drawn into small talk is much higher, which might be awkward or irritating. But still, y'know, better than a bear.

But yeah, 99% of the time neither the woods, nor people walking within them, are dangerous or scary, and I think the folks debating this question should get off social media and take a woodland walk, cause walking alone in the woods rules actually!

#I mean #If you're walking alone in the woods #There's a non-zero chance the man you meet is me #And we can silently walk past each other #And not interact at all

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confessedlyfannish · 21 days

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Writing Prompt #12

Bruce is reading the paper when the pour of Tim's coffee goes abruptly quiet. It would be hard to pinpoint why this is disturbing if it wasn't for the way the soft, tinny sound the vent system in the manor makes cuts out for the first time since being updated in the 90s. The pour, Bruce realizes, has not slowed to a trickle before stopping. It has simply stopped. And there is no overeager clack of a the mug against the marble counter or the uncouth first slurp (nor muttered apology at Alfred's scolding look) immediately following the end of the pour.

Bruce fights the instinct to use all of his senses to investigate, and instead keeps his eyes on the byline of the article detailing the latest set of microearthquakes to hit the midwest in the last week. Microearthquakes aren't an unusual occurrence and aren't noticeable by human standards, which is why this article is regulated to page seven, but from several hundred a day worldwide to several hundred a day solely in the East North Central States, seismologists are baffled.

Bruce had been considering sending Superman to investigate under the guise of a Daily Planet article requested by Bruce Wayne (Wayne Industries does have an offshoot factory in the area) when everything had stopped twenty seconds ago. That is what he assumes has happened (having not moved a muscle to confirm) in the amount of time he assumes has passed. His million dollar Rolex does not quite audibly tick but in the absolute silence it should be heard, which confirms the silence to be exactly that—absolute.

While Bruce can hold his breath with the best of the Olympian swimmers, he has never accounted for a need to remain without blinking without being able to move one's eyes. Rotating the eyeballs will maintain lubrication such that one could go without blinking for up to ten minutes. But staring at the byline fixedly, he estimates another twenty seconds before tears start to form.

These are the thoughts Bruce distracts himself with, because he doesn't dare consider how Tim and Alfred haven't made a (living) sound in the past forty-five seconds. About Damian, packing his bag upstairs for school after a morning walk with Titus that was "just pushing it, Master Damian".

There is a knife to his right, if memory serves (it does). In the next five seconds—

"Your wards and guardian are fine, Mr. Wayne," the deepest voice Bruce has ever heard intones. For a dizzying moment, it is hard to pinpoint the location of the voice, for it comes from everywhere—like the chiming of a clocktower whilst inside the tower, so overpowering he is cocooned in its volume.

But it is not spoken loudly, just calmly, and when he puts the paper down, folds it, and looks to his right, a blue man sits in Dick's chair.

He wears a three piece suit made entirely of hues of violet, tie included. He has a black brooch in the shape of a cogwheel pinned to his chest pocket, a simple chain clipped to his lapel. Black leather gloves delicately thumb Bruce's watch (no longer on his wrist, somewhere between second 45 and 46 it has stopped being on his wrist), admiring it.

"You'll forgive me," the man says with surety. "Clocks are rather my thing, and this is an impressive piece." He turns it over and reveals the 'M. Brando' roughly scratched into the silver back. He frowns.

"What a shame," he says, placing it face side up on the table.

"Most would consider that the watch's most valuable characteristic." Bruce says, voice steady, hands neatly folded before him. Two inches from the knife. To his left, there is an open doorway to the kitchen. If he turns his head, he might be able to get a glance of Tim or Alfred.

He doesn't look away from the man.

"It is the arrogance of man," the man says, raising red eyes (sclera and all) to Bruce, "to think they can make their mark on time."

"...Is that supposed to be considered so literally?" Bruce asks, with a light smile he does not mean.

The man smiles lightly back, eyes crinkling at the corners. He looks to be in his mid thirties, clean-shaven. His skin is a dull blue, his hair a shock of white, and a jagged scar runs through one eye and curving down the side of his cheek, an even darker, rawer shade of blue-purple.

The man turns the watch back over and taps at the engraving. "Let me ask you this," he says. "When we deface a work of art, does it become part of the art? Does it add to its intrinsic meaning?"

Bruce forces his shoulders to shrug. "It's arbitrary," he says. "A teenager inscribes his name on the wall of an Ancient Egyptian temple and his parents are forced to publicly apologize. But runic inscriptions are found on the Hagia Sophia that equate to an errant Viking guard having inscribed 'Halfdan was here' and we consider it an artifact of a time in which the Byzantine Empire had established an alliance with the Norse and converted vikings to Christianity."

"The vikings were as errant as the teenager," the man says, "in my experience." He leans back in his chair. "I suppose you could say the difference is time. When time passes, we start to think of things as artistic, or historical. We find the beauty in even the rubble, or at least we find necessity in the destruction..."

He offers Bruce the watch. After a moment, Bruce takes it.

"The problem, Mr. Wayne, is that time does not pass for me. I see it all as it was, as it is, as it ever will be, at all times. There is no refuge from the horror or comfort in that one day..." he closes his hand, the leather squeaking. And then his face smooths out, the brief severity gone. He regards Bruce calmly.

"You can look left, Mr. Wayne."

Bruce looks left. Framed by the doorway, Tim looks like a photograph caught in time. A stream of coffee escapes the spout of the stainless steel pot he prefers over the Breville in the name of expediency, frozen as it makes its way to the thermos proclaiming BITCH I MIGHTWING. Tim regards his task with a face of mindless concentration, mouth slack, lashes in dark relief against his pale skin as he looks down at the mug. Behind him, Bruce can see Alfred's hand outstretched towards the refrigerator handle, equally and terrifyingly still.

"My name is Clockwork," the man says. "I have other names, ones you undoubtedly know, but this one will be bestowed upon me from the mouth of a child I cherish, and so I favor it above all else. I am the Keeper of Time."

"What do you want from me?" Bruce asks, shedding Wayne for Batman in the time it takes to meet Clockwork's eyes. The man acknowledges the change with a greeting nod.

"In a few days time, you will send Superman to the Midwest to investigate the unusual seismic activity. By then, it will be too late, the activity will be gone. They will have already muzzled him."

"Him."

"There is a boy with the power to rule the realm I come from. Your government has been watching him. The day he turned 18, they took him from his family and hid him away. I want you to retrieve him. I want you to do it today."

"Why me?"

"His parents do not have the resources you do, both as Batman and Bruce Wayne. You will dismantle the organization that is keen on keeping him imprisoned, and you will offer him a scholarship to the local University. You and yours will keep him safe within Gotham until he is able to take his place as my King."

This is a lot of information to take in, even for Bruce. The idea that there could be a boy powerful enough to rule over this (god, his mind whispers) entity and that somehow, he has slipped under all of their radars is as frustrating as it is overwhelming. But although Clockwork has seemed willing to converse, he doesn't know how many more questions he will get.

"You have the power to stop time," he decides on, "why don't you rescue him? Would he not be better suited with you and your people?"

"Within every monarchy, there is a court," Clockwork. "Mine will be unhappy with the choice I have made," he looks at Bruce's watch, head cocked. "In different worlds, they call you the Dark Knight. This will be your chance to serve before a True King."

Bruce bristles. "I bow to no one."

"You'll all serve him, one day," Clockwork says, patiently. "He is the ruler of realms where all souls go, new and old. When you finally take refuge, he will be your sanctuary." He frowns. "But your government rejects the idea of gods. All they know is he is other. Not human. Not meta. A weapon."

"A weapon you want me to bring to my city."

"I believe you call one of your weapons 'Clark', do you not?" Clockwork asks idly. "But you misunderstand me. They seek to weaponize him. He is not restrained for your safety, but for their gain."

"And if I don't take him?" Bruce asks, because a) Clockwork has implied he will be at the very least impeded, at worst destroyed over this, and b) he never did quite learn not to poke the bear. "You won't be around if I decide he's better off with the government."

"You will," Clockwork says, with the same certainty he's wielded this entire conversation. "Not because he is a child, though he is, nor because you are good, though you are, nor even because it is better power be close at hand than afar.

"I have told you my court will be unhappy with me. In truth, there are others who also defend the King. Together we will destroy the access to our world not long after this conversation. The court will be unable to touch him, but neither will we as we face the repercussions for our actions. I am telling you this, because in a timeline where I do not, you think I will be there to protect him. And so when he is in danger, even subconsciously, you choose to save him last, or not at all. And that is the wrong choice.

"So cement it in your head, Bruce Wayne," the man says, "You will go to him because I tell you to. And you will keep him safe until he is ready to return to us. He will find no safety net in me. So you will make the right choice, no matter the cost."

"Or, when our worlds connect again, and they will," his voice now echoes in triplicate with the voices of the many, the young, the old, Tim, Bruce's mother, Barry Allen, Bruce's own voice, "I will not be the only one who comes for you."

"Now," he says, producing a Wayne Industries branded BIC pen. "I will tell you the location the boy is being kept, and then I would like my medallion back, please. In that order."

Bruce glances down and sees a golden talisman, attached to a black ribbon that is draped haphazardly around the neck of his bathrobe, so light (too light, he still should have—) he has not felt its weight until this moment.

Bruce flips the paper over, takes the pen, and jots down the coordinates the being rattles off over the face of a senator. By his calculation, they do correspond with a location in the midwest.

"You will find him on B6. Take a left down the hallway and he will be in the third room down, the one with a reinforced steel door. Take Mr. Kent and Mr. Grayson with you, and when you leave take the staircase at the end of the hallway, not the elevator."

The man gets up, dusts off his impeccably clean pants, and offers him a hand to shake.

"We will not meet again for some time, Mr. Wayne."

Bruce looks at the creature, stands, and shakes his hand. It feels like nothing. The Keeper of Time sighs, although nothing has been said.

"Ask your question, Mr. Wayne."

"I have more than one."

"You do," Clockwork says. "But I have heard them all, and so they are one. Please ask, or I will not be inclined to answer it."

"What does this boy mean for the future, that you are willing to sacrifice yourself for him?"

There is a pause.

"So that is the one," Clockwork says, after a time. "Yes. I see. I should resolve this, I suppose."

"Resolve what?"

"It is not his future I mean to protect," the man says. "It is his present."

"You want to keep him safe now..." Bruce says, but he's not sure what the being is trying to say.

"I am not inclined," Clockwork repeats, stops. His expression turns solemn, red eyes widening. In their reflection, Bruce can see something. A rush of movement too quick to make heads or tails of, like playing fast forward on a videotape. "Superman reports no signs of unusual seismic activity. With nothing further to look into, you let it go in favor of other investigative pursuits. You do not find him, as you are not meant to. He stays there. His family, his friends, they cannot find him. His captors tell him they have moved on. He does not believe them, until he does. He stays there. He stays there until he is strong enough to save himself."

Clockwork speaks stiffly, rattling off the chain of events as if reading a Justice League debrief. "He is King. He will always be King. He is strong, and good, and compassionate, and he is great for my people because yours have betrayed his trust beyond repair. He throws himself into being the best to ever Be, because there is nothing Left for him otherwise. We love him. We love him. We love him. My King. Forevermore."

The red film in his eyes stall out, and Bruce is forced to look away from how bright the image is, barely making out a silhouette before they dull back to their regular red.

"I am not inclined," Clockwork says slowly, "To this future."

"Because of what it means in the present," Bruce finishes for him. "They're not just imprisoning him, are they."

"They will have already muzzled him."

Clockworks is right in front of him faster than he can process, fist gripping the medallion at his neck so tight he now feels the ribbon digging into his skin.

"Unlike you, Mr. Wayne," and for the first time, the god is angry, and the image of it will haunt Bruce for the rest of his life, "I do not believe in building a better future on the back of a broken child."

"Find him," the deity orders, and yanks the necklace so hard the ribbon rips—

Clack!

"sluuuuurp!"

"Master Timothy, honestly!"

"Sorry Alfred!"

#i feel like I'm going to reread this and want to add other stuff #but I also just want to post it and get it out there #fun fact i scribbled a bunch of lines down at 2am bc i didn't want to forget them #im bad at multiple drafts #my writing #dp x dc #dp x dc au #dp x dc prompt #dp x dc crossover #danny phantom #batman #i live to make everybody dramatic #but also i subscribe to a world where clockwork doesn't know how NOT to be dramatic #lol he's a ghost from all of time he doesn't know how to speak to humans and tailor it to the century let alone the decade #and his favorite little girl who calls him clocky loves how he speaks so #he doesn't need to change for nobody #nor feels inclined to #also I feel like as god he's way more inclined to threaten to get what he wants than like...be vulnerable #jazz: let's unpack that #clockwork: we never do #jazz: are you saying that because it's true or because that's what you want to be true?#clockwork: ...#also I cannot take credit for BITCH I MIGHTWING #wish i could #that is cash money right there #shoutout to 11thsense

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i-am-mldy · 2 months

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I truly mourn for Katara as a character in this adaptation.

She was all pent up frustration and anger, towards her circumstances who made her a caretaker, to her brother who didn't take her bending seriously, to her bending masters who didn't want to even teach her at first.

She wasn't always this kind and gentle figure in the group. She was impulsive, followed her heart more than her head. She was prideful, hence why she lashed out at Aang for being a prodigy, picking up quickly what took her weeks to master. She had a temper, which is why she butt heads with Toph, a literal hard headed child.

She was a 14 year old girl who wanted to be more than what she was, who knew she could be more, while the rest of the world didn't think so.

So she always made a point to make herself heard and known.

If the live action just had this, I would be 100% in their corner. I would deal with the writing cus that's just how it is with adaptations. But they didn't, so now I can't really dislike it, but it's not a favorite I could defend from criticism.

#avatar the last airbender #thinking of rewatching the original just to soothe my soul #katara #atla live action #netflix #and tbh the actress's acting ig also contributed to this but that could be fixed w experience. we need more seasons at least for this alone

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