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When Dwarfs Meet Giants, and Other True Cosmic Fairy Tales

It’s easy to get lost in fantasy worlds through science-fiction movies and novels, but did you know that some of your favorite fairy tale characters actually exist in cosmic form? From dwarfs and giants to shape-shifters and buried treasure, the universe is home to a multitude of mystical objects.

White Dwarf Stars

You’ve probably heard of dwarfs like Happy and Sneezy (or Gimli and Thorin), but it’s unlikely you’re familiar with the space-dwelling dwarfs with names like Sirius B and ASASSN-16oh. White dwarf stars like these are typically about the size of Earth, which is pretty small as far as stars go. They represent one of three final stages of stellar evolution, along with neutron stars and black holes. Each star’s mass determines which one it will ultimately become. Stars much more massive than the Sun typically become neutron stars or black holes, and lower-mass stars end up as white dwarfs.

Our Sun will eventually become a white dwarf after it exhausts its fuel, but don’t worry — we’ve got several billion years to go! Before it is reduced to a white dwarf it will actually expand into a red giant, swelling out to encompass Earth’s orbit. But we don’t have to wait billions of years to see stellar giants … some already peek out at us from the cosmic deep.

Giants and Supergiants

The red giant star Aldebaran, located about 65 light-years away, is about 5,000 times bigger than Earth. Our Cassini spacecraft imaged Aldebaran through Saturn’s rings in 2006, but you can see it for yourself during northern winter. Just look for the brightest star in the constellation Taurus.

Fairy tale giants may be taller than trees, but these supergiant stars can be over 100,000 times “taller” than our entire planet! Supergiant stars are likely becoming more rare as time goes on. While scientists believe they used to be more common, our whole galaxy now contains just a small smattering of supergiants.

These massive stars grace the galaxy for a relatively small amount of time. They burn through their fuel extremely quickly — in just a few million years, as opposed to hundreds of billions of years for the smallest stars! Supergiants often end their lives in dramatic explosions called supernovae.

Betelgeuse — the bright, reddish star marking the shoulder of Orion — is nearing the end of its life and has expanded to become a red supergiant star. It is destined to explode as a supernova, which might happen tonight … or within the next few hundred thousand years.

Ghostly Solar Neutrinos

Even an average star like our Sun has some seemingly magical qualities. Each second, it sends billions of phantom-like neutrino particles out into space. They travel almost as fast as light and don’t usually interact with normal matter. Billions of them are zipping harmlessly straight through your body while you read this. Even at night they go through the entire Earth before reaching you!

But that’s not all … these ghostly particles are shape-shifters, too! Neutrinos can change characteristics over time, morphing between different versions of themselves. Spooky!

Buried Treasure in the Heart of the Galaxy

Extensive clouds of dust enshroud the heart of our Milky Way galaxy, hiding it from our view — at least when it comes to visible light. The dust isn’t as big a problem for infrared light, however, which has allowed us to get a glimpse of our galaxy’s chaotic core thanks to our Hubble and Spitzer space telescopes.

Future missions may peer into the galactic core in search of buried treasure — thousands of planets orbiting distant stars!

Want to learn about more cosmic objects? Find them here!

Make sure to follow us on Tumblr for your regular dose of space: http://nasa.tumblr.com

Happy Fossil Friday! Even though this animal looks like a big lizard, it is one of the early relatives of mammals: meet Edaphosaurus! It lived 280 million years ago, in the Permian Period. The key feature that tells us Edaphosaurus is related to mammals? The synapsid opening behind each eye socket. Photo: © AMNH

shanemichaelblack

Stormy skies at Maroon Bells a couple years ago.

the fact that we can map sedimentary units from space is really cool and also Mars is cool!

Yuanyang Rice Terraces

This aerial view of the mountains of Yuanyang Couny of the Yunnan province in south China presents a spectacular visual of the rice terraces that cover the landscape. Due to the scarcity of level ground, only about 5% of the land is used for agriculture. However, the Hani people, the predominant ethnic group of the region, have adapted very well.

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What if... what if I WANT an info dump???

Then you're my favorite and I will dump SO much info on natrocarbonatite lava

No one knows for sure why or how this type of lava forms. Oldoinyo Lengai is the only volcano on earth that actively erupts it currently, and Oldoinyo Lengai hasn't been extensively studied.

The factor that causes lava to be viscous (thick, and sticky) is its silica content. Rhyolitic magmas, like those in Washington, have around 70 weight % silica. Basaltic magmas, like the volcanoes in Hawai'i, are around 45 wt% silica. Natrocarbonatite lava is less than 3% silica. Its flow rate is close to water, so it flows faster than you can outrun.

It's also a LOT less hot than other lavas. Most lavas are from 700-1200 degrees C (basaltic lavas in the higher range, rhyolitic lavas in the lower), but natrocarbonatite is around 500-600 degrees C. It's cool enough that you won't immediately die if you fall into it (you'll be hospitalized for months, as one man who fell into it was, but it's survivable). It's so cool that you can't see it glow in daylight.

It flows black and cools white! This is because of its content of the minerals nyerereite and gregoryite, which are unstable and break down quickly when exposed to humidity.

Basically it's cool as fuck literally and figuratively and I'm obsessed with it

Follower celebration: Make me choose between __and __

@x-kytanna-x asked: Thorin or Bilbo?

Iceland: Landmannalaugar, Suðurland

growth of a seed

Unearthing Ireland’s deepest fairy secrets and darkest myths

A fairy fort, with corn stooks of four sheaves each, in Loughinisland, Co Down, in 1962. Photograph: Michael J Murphy/duchas.ie

“A worldwide crowdsourcing movement is currently unearthing Ireland’s deepest fairy secrets and darkest myths. A voluntary collective online is working its way through transcribing 700,000 pages of folklore that were collected throughout Ireland between 1937 and 1939. This mass of previously inaccessible material was gathered by more than 100,000 children who were sent to seek out the oldest person in their community just before second World War to root out the darkest, oddest and weirdest traditional beliefs, secrets and customs, which were then logged into 1,128 volumes, titled the Schools’ Manuscripts Collection.

Half a million pages have been digitised by the National Folklore Collection, of which more than 100,000 pages have now been transcribed by volunteers, revealing the fairy situation in every townland, the types of leprechaun and butter churn common to each area, the names of people who tried to steal gold and what happened to them, or who had relationships with mermaids. There is material on local cures, holy wells, strange animals, travelling folk and spirits.”

The Irish Times

OMG. THIS IS AMAZING.