Every Single Tumblr User Ever To Exist:
Every single Tumblr user ever to exist:
I will die a hundred deaths, live through a thousand agonies, lift the mountains upon my shoulders, hold the sky above my head, have the earth crack beneath my feet, swallow a cockroach whole, watch my loved ones decay, stare the devil in the eye and watch him tremble, hand over his title; he was merely a fraud.
But I won't press reblog.
More Posts from Crispygardenerpizza and Others
A recently blinded man goes to a doctor and explains his issues to him. The doctor nods and says, "I see your problem." The blind man sighs and says, "Well I don't."
tears drip from your eyes, streaming down your face and I call the plumber because there seems to be a leak
he will know what to do.
advertising has literally come to the point where we're the products
GOD i just scrolled through instagram for like 5 seconds and it was so repulsive… like a solid 70% of it was ads or algorithm recommended content based on who i follow or what i liked. every third post was a video and there was so much product placement and sometimes a little tag on photos so you can go buy the product directly on and through instagram. maybe i’m just old (i’m not) but how do people use that app every day for hours? i feel like i just walked through hell
i need to pin this on my shirt right now
the good old days..
I just love space so much man
Cosmic Alphabet Soup: Classifying Stars
If you’ve spent much time stargazing, you may have noticed that while most stars look white, some are reddish or bluish. Their colors are more than just pretty – they tell us how hot the stars are. Studying their light in greater detail can tell us even more about what they’re like, including whether they have planets. Two women, Williamina Fleming and Annie Jump Cannon, created the system for classifying stars that we use today, and we’re building on their work to map out the universe.
By splitting starlight into spectra – detailed color patterns that often feature lots of dark lines – using a prism, astronomers can figure out a star’s temperature, how long it will burn, how massive it is, and even how big its habitable zone is. Our Sun’s spectrum looks like this:
Astronomers use spectra to categorize stars. Starting at the hottest and most massive, the star classes are O, B, A, F, G (like our Sun), K, M. Sounds like cosmic alphabet soup! But the letters aren’t just random – they largely stem from the work of two famous female astronomers.
Williamina Fleming, who worked as one of the famous “human computers” at the Harvard College Observatory starting in 1879, came up with a way to classify stars into 17 different types (categorized alphabetically A-Q) based on how strong the dark lines in their spectra were. She eventually classified more than 10,000 stars and discovered hundreds of cosmic objects!
That was back before they knew what caused the dark lines in spectra. Soon astronomers discovered that they’re linked to a star’s temperature. Using this newfound knowledge, Annie Jump Cannon – one of Fleming’s protégés – rearranged and simplified stellar classification to include just seven categories (O, B, A, F, G, K, M), ordered from highest to lowest temperature. She also classified more than 350,000 stars!
Type O stars are both the hottest and most massive in the new classification system. These giants can be a thousand times bigger than the Sun! Their lifespans are also around 1,000 times shorter than our Sun’s. They burn through their fuel so fast that they only live for around 10 million years. That’s part of the reason they only make up a tiny fraction of all the stars in the galaxy – they don’t stick around for very long.
As we move down the list from O to M, stars become progressively smaller, cooler, redder, and more common. Their habitable zones also shrink because the stars aren’t putting out as much energy. The plus side is that the tiniest stars can live for a really long time – around 100 billion years – because they burn through their fuel so slowly.
Astronomers can also learn about exoplanets – worlds that orbit other stars – by studying starlight. When a planet crosses in front of its host star, different kinds of molecules in the planet’s atmosphere absorb certain wavelengths of light.
By spreading the star’s light into a spectrum, astronomers can see which wavelengths have been absorbed to determine the exoplanet atmosphere’s chemical makeup. Our James Webb Space Telescope will use this method to try to find and study atmospheres around Earth-sized exoplanets – something that has never been done before.
Our upcoming Nancy Grace Roman Space Telescope will study the spectra from entire galaxies to build a 3D map of the cosmos. As light travels through our expanding universe, it stretches and its spectral lines shift toward longer, redder wavelengths. The longer light travels before reaching us, the redder it becomes. Roman will be able to see so far back that we could glimpse some of the first stars and galaxies that ever formed.
Learn more about how Roman will study the cosmos in our other posts:
Roman’s Family Portrait of Millions of Galaxies
New Rose-Colored Glasses for Roman
How Gravity Warps Light
Make sure to follow us on Tumblr for your regular dose of space!
