Beautiful: #timelapse Of #NorthernLights In #Manitoba.
Beautiful: #timelapse of #NorthernLights in #Manitoba.
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"What's it like to go in the Tardis?" "It's the best place EVER!" "Kids Ask The Doctor Questions - go to our YouTube for the full version!"
Atlantis STS-71 attached to Mir Space Station (phone) Click the image to download the correct size for your phone in high resolution
Comets have two tails.
There are two types of comet tails: dust and gas ion.
A dust tail contains small, solid particles that are about the same size found in cigarette smoke. This tail forms because sunlight pushes on these small particles, gently shoving them away from the comet’s nucleus. Because the pressure from sunlight is relatively weak, the dust particles end up forming a diffuse, curved tail.
A gas ion tail forms when ultraviolet sunlight rips one or more electrons from gas atoms in the coma, making them into ions (a process called ionization). The solar wind then carries these ions straight outward away from the Sun. The resulting tail is straighter and narrower. Both types of tails may extend millions of kilometers into space. As a comet heads away from the Sun, its tail dissipates, its coma disappears, and the matter contained in its nucleus freezes into a rock-like material.
Comets don’t like the sun.
Comets lose a lot of mass when they go by the Sun. A lot: some shed hundreds of tons of material per second. That’s actually a small fraction of the mass of a comet, but given time, and lots of solar passes, it adds up. Every comet we see is slowly dissolving in space. Eventually even the mighty Comet Halley will be gone, broken down into a swarm of rocks, gravel, and dust once its gas is gone.
The "Ebru Style" is a painting technique in which the artist manipulates paint on the surface of dark water to create amazing works of art.
Ask Ethan #110: What did the sky look like when Earth first formed?
“In general, what would the night time skies have looked like to an observer on a newly cooling Earth 4 billion years ago? Would the night sky be the same? Brighter?”
The night sky is a memorable, inimitable sight. With the exception of the planets, the stars that shine so brightly and consistently on your birthday will be the same ones — in both position and brightness — that shine on your dying day. But as recognizable as the stars and constellations are, the skies we recognize would have nothing in common with the skies as they were back when Earth first formed more than four billion years ago. With natural light pollution from volcanism and heat, a location inside a star cluster and the evolution of our local Universe, there are some huge differences that would make for some big surprises.
NASA's Langley Research Center released video of multiple aircraft going through crash tests, which they examine to improve safety measures.
Yiiiiiiiiikkkkkkkesssss! "This takes guts."
