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#Guardian 📆 Tue 4 Jul 2023 If successful, #BreakthroughStarshot could get to #AlphaCentauri 🪐 not in 76,000 years but in just 20. It would revolutionise our understanding of the #universe 🌌 by enabling closeup observations of #exoplanets and their atmospheres, and potentially even detecting signs of life.

In 100 years’ time the question ‘are we alone in the universe?’ may seem as ridiculous as the idea of the #Earth being at the centre of the #universe, when we are in contact with a dazzling array of alien life 👽 out there. https://www.theguardian.com/science/2023/jul/04/look-back-and-marvel-how-will-todays-science-be-viewed-in-2123

#guardian #breakthroughstarshot #alphacentauri #universe #Exoplanets #earth

Last updated 1 year ago

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Artemis · @Artemis201

289 followers · 3104 posts · Server mstdn.social

Okay #astrodon folks, can you see a rainbow after sunset? What's the limit? How many degrees below the horizon can the sun be?

I'm designing a tidally locked planet, aka an "eyeball world" with high water content, violent storms at the subsolar point, and creeping glaciers at the antipode. I've got "tropic of Rainbows" starting at 42 degrees sunward from the terminator, but I want to know if there would be any twilight rainbows.
#optics #weather #exoplanets #academicchatter #writing #science

#Science #Writing #academicchatter #Exoplanets #Weather #optics #Astrodon

Last updated 1 year ago

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AutisticMumTo3 She/her 🌈 · @AutisticMumTo3

551 followers · 16808 posts · Server leftist.network

Elon Musk eyes ‘highly habitable’ planet that’s ‘practically next door’ | The Independent
https://www.independent.co.uk/space/elon-musk-spacex-proxima-b-planet-b2356008.html

#Musk
#Exoplanets
#NextDoorNeighbour
#SpaceX
#ProximaCentauri
#GoldilocksZone
#EightyThousandYearJourney

#musk #Exoplanets #NextDoorNeighbour #spacex #proximacentauri #goldilockszone #EightyThousandYearJourney

Last updated 1 year ago

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Steven Saus [he/him] · @StevenSaus

456 followers · 8326 posts · Server faithcollapsing.com

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From 19 May: Newly discovered exoplanet could have liquid water, lots of volcanoes - Enlarge / An artist’s conception of what a volcano-rich exoplanet might look like.NASA’s G... https://arstechnica.com/science/2023/05/earth-sized-exoplanet-has-everything-it-needs-for-lots-of-volcanoes/ #astronomy #atmosphere #exoplanets #science #tidal-forces #volcanoes

#volcanoes #tidal #science #Exoplanets #atmosphere #astronomy

Last updated 1 year ago

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Knowledge Zone · @kzoneind

205 followers · 1128 posts · Server mstdn.social

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#KnowledgeByte: Habitable #Planets / #Exoplanets!

What is our Plan B when we make Earth Inhabitable?

https://knowledgezone.co.in/posts/5a8bad5f4cbd612a7c16856f

#Exoplanets #planets #knowledgebyte

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Steven Saus [he/him] · @StevenSaus

456 followers · 8326 posts · Server faithcollapsing.com

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From 03 May: Caught in the act: Astronomers spot star swallowing a planet for first time - An aging star dubbed ZTF SLRN-2020 has been caught in the act of swallowing a planet.... https://arstechnica.com/science/2023/05/watch-a-distant-death-star-devour-a-gas-giant-planet-in-one-big-gulp/ #astronomy #astrophysics #exoplanets #science #stellar-dynamics

#stellar #science #Exoplanets #astrophysics #astronomy

Last updated 1 year ago

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Alex Howe · @scimeetsfiction

23 followers · 118 posts · Server universeodon.com

arXiv.org - Converting the sub-Jovian desert of exoplanets to a savanna with TESS, PLATO and Ariel

Unsure how I feel about how far people are taking the "landscape" metaphors for #exoplanets. The "sub-Neptune savanna"? "Giraffe planets"? Although it would be cool to label the lower-right corner of the map with "Here be dragons."
https://arxiv.org/abs/2304.05707

#Exoplanets

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Alex Howe · @scimeetsfiction

23 followers · 113 posts · Server universeodon.com

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From Lampón et al.: measuring mass loss from #exoplanets via helium outflows, including my old scientific stomping grounds of GJ 1214b:
https://arxiv.org/abs/2304.03839

Some observations: first--hang on! A heating efficiency of 40%?! We've been assuming an efficiency of ~10% for years, and even then, we weren't sure if photon-limited escape would even be a thing.

A 98/2 ratio of hydrogen to helium is a lot steeper than I would have expected for a hydrodynamic outflow, although apparently in line with theory. Maybe we need to revisit helium-enriched planets. 1/2

#Exoplanets

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Alex Howe · @scimeetsfiction

23 followers · 112 posts · Server universeodon.com

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Hycean #exoplanets are theorized planets with a HYdrogen atmosphere over a water oCEAN. Innes, Tsai, & Pierrehumbert analyze the greenhouse effect in these environments (https://arxiv.org/abs/2304.02698), and find that the "habitable zone" for them could be pushed out as far as Jupiter. Unfortunately, that's where most known planets aren't, so not great for observations.

It also leads me to wonder what the bioavailable energy flux would be to support life that far out and that deep in the atmosphere. There are only so many substitutes for full sunlight.

#Exoplanets

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Alex Howe · @scimeetsfiction

23 followers · 111 posts · Server universeodon.com

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This was not a result I expected. From Lammers, Murray, & Hadden: https://arxiv.org/abs/2304.02634
The standard planetesimal + giant impact planet formation model can successfully replicate the "peas-in-a-pod" phenomenon.

In systems with multiple #exoplanets, we often find they are about the same size. Most solutions try to model it as a formation effect, but this team says planets can start as different sizes and get similar-sized planets out the other end.

This is because when planets collide (as often happens during formation), smaller planets preferentially merge into large ones rather than large ones into even bigger ones. This essentially (statistically) raises the minimum planet size, producing a smaller spread.

And...this is starting to feel like the mass loss question where three of four different solutions can plausibly produce the same result, and we're trying to sort out which one (if any) is right.

#Exoplanets

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Starry Time Podcast · @starrytimepod

273 followers · 566 posts · Server universeodon.com

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Saw something about another increase in #new #Mastodon users -- if you're #newHere -- welcome! 🤗

By way of #introduction, let's be friends if you're interested in:
#astronomy #astrophotography #NASA #space #mythology #Greekmyth #storytelling #constellations or related content!

You can also expect:
- the occasional dunk on Johann Bayer
- strong expressions of love for #BlackHoles and #exoplanets
- ret-con(stellations) of classic constellation stories
-silly/fun constellation-related pop culture
- periodic #StarTrek, #DoctorWho, and #StarWars (mostly #Grogu content
- #podcast promos (but, hopefully, not in an annoying way)

#new #Mastodon #newHere #introduction #astronomy #astrophotography #nasa #Space #mythology #greekmyth #storytelling #constellations #blackholes #Exoplanets #startrek #doctorwho #starwars #grogu #Podcast

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Trying not to be a cave goblin · @jaded_jouska

149 followers · 3 posts · Server kolektiva.social

Interests post for searches:

#Adoptee #Queer #SexWorkIsWork #MutualAid #ACAB #Climate #Trees #Solidarity #Leftist #PublicPolicy #UrbanPlanning #UrbanForest #CovidIsNotOver #DisabilityAlly #TransRights #Privacy #AbortionIsHealthcare #Unionize #Accessibility #ADHD #AuDHD #FOSS #LinuxNewbie #SciFi #Exoplanets #Synesthesia #Shipwreck #StarTrek #Stargate #DoctorWho #Futurama #GhostFiles #Skyrim #MassEffect #RPG #RustyLake #Cats

#adoptee #queer #sexworkiswork #MutualAid #acab #climate #trees #solidarity #leftist #publicpolicy #urbanplanning #urbanforest #CovidIsNotOver #disabilityally #transrights #privacy #AbortionIsHealthcare #Unionize #accessibility #adhd #AuDHD #FOSS #linuxnewbie #scifi #Exoplanets #synesthesia #shipwreck #startrek #stargate #doctorwho #futurama #ghostfiles #skyrim #masseffect #rpg #rustylake #cats

Last updated 1 year ago

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Alex Howe · @scimeetsfiction

22 followers · 95 posts · Server universeodon.com

arXiv.org - A Catalogue of Exoplanet Atmospheric Retrieval Codes

This code catalog by Ryan MacDonald and @nbatalha will be very useful for people analyzing #exoplanets atmospheres. (And includes a shout-out to my own APOLLO code.)
https://arxiv.org/abs/2303.12925

#Exoplanets

Last updated 1 year ago

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Alex Howe · @scimeetsfiction

22 followers · 95 posts · Server universeodon.com

GitHub - GitHub - alexrhowe/ExoVista: A simulator of universes of exoplanets for use in imaging and survey simulations and other applications.

Presenting ExoVista v2.2, our code for generating simulated #exoplanets systems: https://github.com/alexrhowe/ExoVista
Now with transit detection, phase angles, a faster integrator, and more.
(And the post-processing scripts are backwards-compatible.)

#Exoplanets

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grb090423 · @grb090423

3 followers · 234 posts · Server mstdn.social

ESA’s exoplanet missions

ESA’s exoplanet missions.
#ESA #Exoplanets #Cheops #Plato #Ariel
https://www.esa.int/ESA_Multimedia/Videos/2023/03/ESA_s_exoplanet_missions

#ariel #plato #Cheops #Exoplanets #ESA

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Alex Howe · @scimeetsfiction

22 followers · 92 posts · Server universeodon.com

arXiv.org - A Catalog of Exoplanets with Equilibrium Temperature less than 600 K

This paper is a vivid illustration of just how biased our planet detection methods are to hot planets: https://arxiv.org/abs/2303.06214
We've discovered over 5,000 #exoplanets, but only 2% of them are cooler than 600 K. For comparison, Mercury and Venus top out at 700 K.

#Exoplanets

Last updated 1 year ago

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ScienceAlert · @ScienceAlert

253 followers · 101 posts · Server universeodon.com

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This is mesmerizing!! 🌌💫

As you watch these four dots of light moving around a black disk, you're gazing at a planetary system.

The dots are exoplanets, and the disk obscures their star, HR8799, 133.3 light-years from Earth. Their orbital movements are time-lapsed from 12 years of data.

Astronomer Jason Wang made this for no scientific reason other than it’s super awesome! He says “I hope it enables people to enjoy something wondrous."

📷 Jason Wang/W. M. Keck Observatory/YouTube

#astronomy #astrophotography #exoplanets #PlanetarySystem #science #ScienceMastodon #ScienceAlert #STEM

#astronomy #astrophotography #Exoplanets #planetarysystem #Science #sciencemastodon #sciencealert #stem

Last updated 1 year ago

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