letsatomicbanana

[letsatomicbanana]

shit getting very real in the American Revolution tiktok fandom today

[letsatomicbanana]

Astronomers used three of NASA's Great Observatories to capture this multiwavelength image showing galaxy cluster IDCS J1426.5+3508. It includes X-rays recorded by the Chandra X-ray Observatory in blue, visible light observed by the Hubble Space Telescope in green, and infrared light from the Spitzer Space Telescope in red. This rare galaxy cluster has important implications for understanding how these megastructures formed and evolved early in the universe.

How Astronomers Time Travel

Let’s add another item to your travel bucket list: the early universe! You don’t need the type of time machine you see in sci-fi movies, and you don’t have to worry about getting trapped in the past. You don’t even need to leave the comfort of your home! All you need is a powerful space-based telescope.

But let’s start small and work our way up to the farthest reaches of space. We’ll explain how it all works along the way.

This animation illustrates how fast light travels between Earth and the Moon. The farther light has to travel, the more noticeable its speed limit becomes.

The speed of light is superfast, but it isn’t infinite. It travels at about 186,000 miles (300 million meters) per second. That means that it takes time for the light from any object to reach our eyes. The farther it is, the more time it takes.

You can see nearby things basically in real time because the light travel time isn’t long enough to make a difference. Even if an object is 100 miles (161 kilometers) away, it takes just 0.0005 seconds for light to travel that far. But on astronomical scales, the effects become noticeable.

This infographic shows how long it takes light to travel to different planets in our solar system.

Within our solar system, light’s speed limit means it can take a while to communicate back and forth between spacecraft and ground stations on Earth. We see the Moon, Sun, and planets as they were slightly in the past, but it's not usually far enough back to be scientifically interesting.

As we peer farther out into our galaxy, we use light-years to talk about distances. Smaller units like miles or kilometers would be too overwhelming and we’d lose a sense of their meaning. One light-year – the distance light travels in a year – is nearly 6 trillion miles (9.5 trillion kilometers). And that’s just a tiny baby step into the cosmos.

The Sun’s closest neighboring star, Proxima Centauri, is 4.2 light-years away. That means we see it as it was about four years ago. Betelgeuse, a more distant (and more volatile) stellar neighbor, is around 700 light-years away. Because of light’s lag time, astronomers don’t know for sure whether this supergiant star is still there! It may have already blasted itself apart in a supernova explosion – but it probably has another 10,000 years or more to go.

What looks much like craggy mountains on a moonlit evening is actually the edge of a nearby, young, star-forming region NGC 3324 in the Carina Nebula. Captured in infrared light by the Near-Infrared Camera (NIRCam) on NASA’s James Webb Space Telescope, this image reveals previously obscured areas of star birth.

The Carina Nebula clocks in at 7,500 light-years away, which means the light we receive from it today began its journey about 3,000 years before the pyramids of Giza in Egypt were built! Many new stars there have undoubtedly been born by now, but their light may not reach Earth for thousands of years.

An artist’s concept of our Milky Way galaxy, with rough locations for the Sun and Carina nebula marked.

If we zoom way out, you can see that 7,500 light-years away is still pretty much within our neighborhood. Let’s look further back in time…

This stunning image by the NASA/ESA Hubble Space Telescope features the spiral galaxy NGC 5643. Looking this good isn’t easy; 30 different exposures, for a total of nine hours of observation time, together with Hubble’s high resolution and clarity, were needed to produce an image of such exquisite detail and beauty.

Peering outside our Milky Way galaxy transports us much further into the past. The Andromeda galaxy, our nearest large galactic neighbor, is about 2.5 million light-years away. And that’s still pretty close, as far as the universe goes. The image above shows the spiral galaxy NGC 5643, which is about 60 million light-years away! That means we see it as it was about 60 million years ago.

As telescopes look deeper into the universe, they capture snapshots in time from different cosmic eras. Astronomers can stitch those snapshots together to unravel things like galaxy evolution. The closest ones are more mature; we see them nearly as they truly are in the present day because their light doesn’t have to travel as far to reach us. We can’t rewind those galaxies (or our own), but we can get clues about how they likely developed. Looking at galaxies that are farther and farther away means seeing these star cities in ever earlier stages of development.

The farthest galaxies we can see are both old and young. They’re billions of years old now, and the light we receive from them is ancient since it took so long to traverse the cosmos. But since their light was emitted when the galaxies were young, it gives us a view of their infancy.

This animation is an artist’s concept of the big bang, with representations of the early universe and its expansion.

Comparing how fast objects at different distances are moving away opened up the biggest mystery in modern astronomy: cosmic acceleration. The universe was already expanding as a result of the big bang, but astronomers expected it to slow down over time. Instead, it’s speeding up!

The universe’s expansion makes it tricky to talk about the distances of the farthest objects. We often use lookback time, which is the amount of time it took for an object’s light to reach us. That’s simpler than using a literal distance, because an object that was 10 billion light-years away when it emitted the light we received from it would actually be more than 16 billion light-years away right now, due to the expansion of space. We can even see objects that are presently over 30 billion light-years from Earth, even though the universe is only about 14 billion years old.

This James Webb Space Telescope image shines with the light from galaxies that are more than 13.4 billion years old, dating back to less than 400 million years after the big bang.

Our James Webb Space Telescope has helped us time travel back more than 13.4 billion years, to when the universe was less than 400 million years old. When our Nancy Grace Roman Space Telescope launches in a few years, astronomers will pair its vast view of space with Webb’s zooming capabilities to study the early universe in better ways than ever before. And don’t worry – these telescopes will make plenty of pit stops along the way at other exciting cosmic destinations across space and time.

Learn more about the exciting science Roman will investigate on X and Facebook.

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

[letsatomicbanana]

We have got to stop using "art" as a complimentary term because it makes people dismiss any aesthetic works they dislike or don't understand as "not art" even when there's nothing else it could be from a categorical perspective. Calling it what it obviously is is not some admission of quality and enjoyment, it can be shitty art you hate. Most art is pretty bad! But there's people out here making fools of themselves straight up looking at paint applied deliberately to a canvas and going "this isn't art" like well then what is it Jeremy. A three course meal? A live raccoon?

[letsatomicbanana]

Over 800 terrestrial exoplanets visualized and arranged according to their equilibrium temperature and size.

chart by u/mVargic

[letsatomicbanana]

i lowkey regret joining utmv fandom tbh. how am i supposed to become a proper astrophysicist when this multidimentional whore never leaves my head

[letsatomicbanana]

lesbian situantionship aside, i'm aroace lmao

[letsatomicbanana]

how undertale au fans look at you when you say that your favourite sans au is ink/error sans instead of ultrassom sans 3000 who appeared in one canceled fangame from 2015 that can be only found in a site that takes 50 spywares to get in

[letsatomicbanana]

the birds are parading!! ✨🪿🦆🦅🦜 contribution for the book Charivari - Masks and Swords 💛

[letsatomicbanana]

Saturn’s Famous Hexagon !

This colorful view from NASA's Cassini mission is the highest-resolution view of the unique six-sided jet stream at Saturn's north pole known as "the hexagon."

NASA/JPL-Caltech/SSI/Hampton University

[letsatomicbanana]

i'll go to physics college, wish me luck

[letsatomicbanana]

there is no easter bunny, there is no tooth fairy, and there is no known habitable exoplanets

[letsatomicbanana]

I think sometimes people think eugenics is bad but its still true, like thinking that if people with certain traits have children it will change society for better or worse based upon what traits are promoted. I think its important to emphasize that eugenics is not only wrong morally it's also fake and stupid bullshit

Like eugenics was supposed to be based on the idea that "If it works with animals to select only the best ones to breed, why wouldn't it work with humans?"

well it doesn't work with animals, that's the thing. applying the eugenics ideas to domestic breeds of animals hasn't made better animals it's just made animals with more extreme expression of certain traits. turns out that when you decide which traits are the "best" and become obsessed with the genetic purity of the animals that have the "best" traits, you might well end up with some sad suffering creature like a Pug, or the Persian cats with the smashed faces that are in constant pain because their teeth and airways and brains are getting crushed by their skulls, or those meat chickens that grow so fast they can hardly even stand up after a few weeks old, or inbred race horses with tiny feet and fragile toothpick legs

like almost all traits are neither "good" or "bad" they're way more complex than that. a long tail or a long snout or a stubborn, independent personality can be good or bad depending on the situation. Who gets to decide what is a "good" trait or a "bad" trait? It's arbitrary and selecting for traits that are "good" in your opinion will often have both "good" and "bad" outcomes because the "good" and "bad" are part of each other and not separate its just part of being alive

Obviously oversimplifying everything but you get it. we did eugenics with dogs and how did that go? not very well

[letsatomicbanana]

norwegian is an incredible language

[letsatomicbanana]

This color image, produced from a distance of about 16 million kilometers, shows several complex and puzzling atmospheric features. Credit: NASA/JPL

[letsatomicbanana]

Saturn peeking behind the Moon, seen from the top of the Mauna Kea Volcana, in Hawaii, in September 2024. Do you realise a person on Earth took that picture. Wow.

[letsatomicbanana]

I FUCKING LOVE INFORMATION!!! I WANT TO LEARN EVERYTHING AND KNOW EVERYTHING!!!!! I WANT TO UNDERSTAND EVERYTHING ABOUT LIFE, THE UNIVERSE, AND EVERYTHING!!!!!! I AM UTTERLY CONSUMED BY MY THIRST FOR KNOWLEDGE!!!!!!!!!!!!

[letsatomicbanana]

NASA released the clearest pictures yet of our neighbours in the solar system

Oh and of course us

Honourable mention