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traverse-our-universe · 1 month

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Comet 12P/Pons-Brooks by Babak Tafreshi

#stars #astrophotography #space #astronomy #comet #comet 12p/pons brooks #night sky #photographers on instagram #curators on tumblr #space blog #mine #shooting star

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uncontrolledfission · 3 months

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What are exoplanets, and how do we detect them?

Post #16 in Physics and Astronomy, 14/01/2023

Welcome back,

First of all: what are exoplanets?

An exoplanet, by definition, is a planet outside our solar system that usually orbits another star within the galaxy. The exoplanets we’ve discovered so far have all been in relatively close proximity, due to limitations in the range of today’s telescopes.

You may have heard of Proxima Centauri b, the exoplanet closest to Earth, resting 4.2 lightyears away from us. Described by NASA as “a potential rocky world, larger than Earth,” it’s kind of a big deal, since it boosts evidence that planets in habitable zones* exist, and are probably quite close to us. We don’t know, however, if the planet has an atmosphere.

*habitable zone: a distance at which temperatures are right for liquid water. Also referred to as the ‘Goldilocks zone.’

How do we detect exoplanets?

There are a number of techniques used by scientists to detect exoplanets, but the two main ones are the transit and radial velocity methods.

Transit: when a planet passes exactly between us and a star it orbits, some of the light provided by the star is blocked. The blockage may be miniscule, nearly imperceptible, but it is still there. It’s just about enough for astronomers to realise that there may be an exoplanet orbiting a star.

Radial velocity: when planets orbit stars, the stars tend to “wobble” a little, i.e. they have an extremely small orbit of their own. This “wobble” changes the colour of light that astronomers see when they observe stars. The light is shifted; if the star is moving in the observer’s direction, it’s shifted to the blue end of the spectrum, and if the star is moving away from the observer, it’ll be red-shifted.

The categories of exoplanets

Gas giants: large planets composed almost entirely of helium and/or hydrogen. Examples familiar to you may include Jupiter or Saturn. Gas giants don’t have hard surfaces; instead, gases swirl above a solid core. However, gas giant exoplanets can be several orders of magnitude larger than Jupiter!

Super-Earths: planets a lot larger than Earth, yet lighter than ice giants like Neptune and Uranus. These can be made of gas, rock, or an arbitrary combination of both. The second closest to us, at the time of writing, is Barnard’s Star b.

Neptunian planets: these are similar to the size of Neptune or Uranus in our solar system. These typically have hydrogen- and helium-filled atmospheres, accompanied by cores of rock and other heavy metals. To date, 1,912 have been discovered, and an example you may recognise is Kepler-1955 b!

Last, but not least, terrestrial planets: examples of these may include Earth, Mars, Mercury, and Venus. For planets outside the solar system, those between half Earth’s size and twice its radius are considered terrestrial. Some rocky exoplanets twice the size of Earth could be terrestrial, but they can also be considered super-Earths. The number of confirmed discoveries for terrestrial planets is a lot lower than Neptune-like planets: we currently have 199!

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In case you're interested in exploring exoplanets further, I've included a range of NASA web pages so you can do so!

#studyblr #alevels #sixth form #gcse #100 days of productivity #stem #physics #engineering #a levels 2025 #astronomy #exoplanets #astrophysics #astrophotography #space #space blog #i love physics #stars #cosmology #astro posts

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cosmicfunnies · 2 years

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I got a job!

I wanted to let you guys know that I finally managed to score a full time job at a fashion company! It’s a graphic designer and illustrator position too! I wasn’t sure if I was even going to get the job in the interview after many other let downs in the past but nope, I was hired the same day!

This is a good step for me as I can now start saving and working on this blog and my online store. In addition, I feel some of my creative juices returning. Posting a new comic will take me a bit so you guys won’t see a new comic until Sunday possibly.

Thank you all for supporting me! It’s been a long 4 and a half years of unemployment but I’m glad it’s over. I’m so excited, I start today!

Have a great rest of your week!

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humanitarian-021 · 2 years

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Strawberry Supermoon on June 14: Where And When To Watch June's Full Moon | All You Need to Know

What is a Strawberry Supermoon? 🌝

June's full moon gets its nickname from the strawberry harvesting season in the Northeastern U.S. It also happens to be at its closest distance to Earth in its orbit, making it a Supermoon by most standards.

The common definition of a Supermoon is any full moon that is at a distance of atleast 90% of perigee (which is at the point at which Moon is closest to the Earth), the Old Farmer's Almanac explains. June's full Moon stands at 222,238.4 miles (357,658 km) away -- comfortably within that cut-off point.

#Strawberry Supermoon #moon #full moon night #full moon #space #outer space #space blog #june #june 14 #nasa #Old Farmer's Almanac #hmt021

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wedarkacademia · 4 months

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juliaxyn · 4 months

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You’re never too old to learn something new. Never stop studying.

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bbunny-bugzz · 12 days

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ppl who think u can't be bred by a strap r so stupid and boring. where's your imagination?? where's your fucking whimsy??? i WILL be pinned down and bred by the strap and i WILL ENJOY IT!!!!!!

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traverse-our-universe · 1 year

Video

youtube

“The featured time-lapse visualization is extrapolated from images with the orbiting Hubble Space Telescope and the WIYN telescope on Kitt Peak in Arizona, USA. The 3D-computer model on which this visualization is based includes artistic interpretations, and distances are significantly compressed.”

(APOD/NASA). Visualization Credit: NASA, ESA, and F. Summers, G. Bacon, Z. Levay, and L. Frattare (Viz 3D Team, STScI); Acknowledgment: T. Rector/University of Alaska Anchorage, H. Schweiker/WIYN and NOAO/AURA/NSF, NASA, ESA, and the Hubble Heritage Team (STScI/AURA)

#ngc 7635 #bubble nebula #space #Hubble Telescope #Astronomy #stars #video #WIYN #WIYN telescope #space exploration #space blog #science blog #nebula #NASA #ESA #mine

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lottiestudying · 6 months

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12.11.2023—had a few slow study days to deal with my mental health. had some time to think through my analysis, so have some more clarity there. hopefully this week i can finish a second full first draft

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galactica-starblog · 1 year

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STAR BLOG OFFICAL DOC !!!!

The official document of extra-terrestrious questions and answers !! You can send in questions for me to answer, or read up on facts about space !! This document is currently 8 pages long and is still being updated (as soon as I can) Please enjoy my passion for SCIENCE ! -Max [please read disclaimer on first page] :o)

#interstellar #space blog #space #astronomy #astro fax #stargazing #meteorology #meteorite #stars #google docs #fun #nerds #stuff

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astraltrickster · 2 years

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This post is your reminder that you are not obligated to blog about current events.

Things are bad. Really bad. Do not let people guilt trip you into tormenting yourself even further over the fact that things are bad. Doomscrolling is not activism.

If you're just on tumblr to blorbopost or reblog pretty pictures, you are not harming people by inaction.

You are not a bad person for not dedicating every aspect of your life and leisure space to whatever disgusting mask-off attack on human life and dignity some government has decided to enact.

Take action where you can, but don't confuse doomscrolling and digital self harm for action.

If you need to lose yourself in blorboposting, go for it.

If you need to log off for the day, whether it's to take irl action or to protect what little sanity any of us have left over the past 7 years, then by all means, do.

Morale is important. Hope is important. Small joys keep us from burning out completely in times like this. Do not let any "if you don't reblog this I'm judging you" guilt trip convince you otherwise.

#serious tag #current events #im gonna be offline for the day working on making doll clothes #this is why i keep my blogging and my activism as separate as i can #and only talk about the dynamics of big irl issues as they apply to hobby spaces most of the time -#because i know myself well enough to know that i WILL fall victim to the doomscrolling cycle #it's happened before and im not going there again

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wedarkacademia · 8 months

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