NASA just cracked open a pristine Apollo moon rock sample
The sample of lunar rock and soil dates to the Apollo 17 mission in 1972.The space agency had the foresight to sock away samples from Apollo missions for later study once technology had advanced. Now's the time for some of these samples to step into the science limelight.
A NASA scientist ' s incredible animation shows how dinosaurs roamed the Earth on the other side of the Milky Way galaxy . Galactic movement is more complicated than the video shows , though. The other stars and planetary systems in the galaxy are also moving, at different speeds
the Milky Way that was recorded using an equatorial tracking mount over a period of around 3 hours to show Earth ' s rotation relative to the Milky Way . All Alone in the Night - Time-lapse footage of the Earth as seen from the ISS - Продолжительность: 2:30 David Peterson 19 079 886 просмотров.
- scientist Jessie Christiansen made a video that traces our solar system's movement through the Milky Way as emerged, , and were replaced by mammals on Earth.
- Our sun orbits , so many dinosaurs roamed the Earth while the planet was on the other side of the Milky Way.
- 's orbit keeps us just the right distance from for life to exist.
When dinosaurs ruled the Earth, the planet was on a completely different side of the galaxy.
The movie 'Interstellar' came out exactly 5 years ago. Since then, new discoveries have changed our understanding of black holes.
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The Milky Way is the galaxy that contains our Solar System , with the name describing the galaxy ' s appearance from Earth : a hazy band of light seen in the night sky formed from stars that cannot be
The Milky Way , like all galaxies , is also surrounded by a vast halo of dark matter, which accounts for some 90% of its mass. Nobody knows precisely what dark matter is, but its mass has been inferred by observations of how fast the galaxy rotates and other general behaviors. More importantly, it is
A new animation by NASA scientistshows just how long the dinosaurs' reign lasted, and how short the era of humans has been in comparison, by tracing our solar system's movement through the Milky Way.
Our sun orbits the galaxy's centre, completing its rotation every 250 million years or so. So Christiansen's animation shows that last time our solar system was at its current point in the galaxy, the Triassic Period was in full swing and dinosaurs were just beginning to emerge. Many of the most iconic dinosaurs roamed Earth when the planet was in a very different part of the Milky Way.
When the Andromeda galaxy crashes into the Milky Way, this is what it could look like from Earth
The Milky Way is on track to collide and merge with its nearest neighbour, the Andromeda galaxy, in about 4 billion years. The galaxies will pass through each other, get snapped back together by gravity, and eventually merge cores. NASA illustrations show what the arrival of an entire galaxy of stars will look like. But while Andromeda's approach will make a bright and spectacular display in the night sky, life on Earth probably won't be around to see it. By then, the sun will have swollen past the orbit of Venus, charring Earth to a crisp. Visit Business Insider's homepage for more stories.
Using infrared images from NASA ' s Spitzer Space Telescope, scientists have discovered that the Milky Way ' s elegant spiral structure is dominated by just two arms wrapping off the ends of a central bar of stars. The annotated artist' s concept illustrates the new view of the Milky Way .
The Milky Way , like all galaxies , is surrounded by a vast halo of dark matter, which accounts At the heart of the Milky Way is a supermassive black hole, just like all of the other galaxies , known as Future of the Milky Way : It is further believed that our galaxy formed through the collisions of smaller
Christiansen got the idea to illustrate this history when she was leading a stargazing party at California Institute of Technology in Pasadena. Attendees were astonished when she mentioned that our solar system had been across the galaxy when dinosaurs roamed.
"That was the first time I realised that those time scales - archaeological, fossil record time scales and astronomical time scales - actually kind of match along together," Christiansen told Business Insider. "Then I had this idea that I could map out dinosaur evolution through the galaxy's rotation."
The resulting video puts both timelines in perspective:
I have always been interested in galactic archaeology, but I don't think this is what they meant.
Did you know that dinosaurs lived on the other side of the Galaxy?
— Dr. Jessie Christiansen (@aussiastronomer)
Hypervelocity star ejected from centre of the Milky Way by supermassive black hole
Forget dejected suitors being sent packing from The Bachelorette finale — scientists have discovered a cosmic breakup as a star is ejected by our black holeAn international team of researchers have found a hypervelocity star that's been ejected from the centre of our galaxy by the resident supermassive black hole, Sagittarius A*.
The Milky Way , like all galaxies , is also surrounded by a vast halo of dark matter, which accounts for some 90% of its mass. That prevents us from seeing the bright galactic center or from observing clearly what is on the other side of it. You might be surprised to learn that it takes the Sun 250 million
within the Milky Way galaxy --in other words, how do we know that our solar system is in the arm of a spiral galaxy , far from the galaxy ' s center? "There is no short answer to this question, because astronomers have followed many lines of evidence to determine the location of the solar system in
Christiansen said it took her about four hours to make the film using timed animations in PowerPoint. She also noted a couple minor corrections to the text in her video: plesiosaurs are not dinosaurs, and we complete a galactic orbit every 250 million years (not 200 million years).
'A spiral through space'
Galactic movement is more complicated than the video shows, though. The other stars and planetary systems in the galaxy are also moving, at different speeds and in different orbits. The inner portions spin faster than the outer regions.
What's more, the galaxy itself is moving through space, slowly approaching the nearby Andromeda galaxy.
"The animation kind of makes it seem like we've come back to the same spot, but in reality the whole galaxy has moved a very long way," Christiansen said. "It's more like we're doing a spiral through space. As the whole galaxy's moving and we're rotating around the centre, it kind of creates this spiral."
So in the solar system's rotation around the galactic centre, we're not returning to a fixed point. The neighbourhood is different from the last time we were here.
Earth, however, is not drastically different; it still supports complex life. That's partially thanks to the path of our sun's galactic orbit.
"Our solar system doesn't travel to the centre of the galaxy and then back again. We always stay about this distance away," Christiansen said.
In other words, even as our solar system travels through the Milky Way, it doesn't approach the inhospitable centre, where life probably wouldn't survive.
"There's a lot of stars, it's dynamically unstable, there's a lot of radiation," Christiansen said. "Our solar system certainly doesn't pass through that."
That's a huge part of why dinosaurs, mammals, or any other form of life can exist on Earth.
Two Vast 'Peacock-Shaped' Cosmic Clouds Spotted by Astronomers in Nearby Galaxy .
The latest findings could have important implications for our understanding of how massive stars form. "For the first time, we uncovered a link between massive star formation and galaxy interactions in very sharp detail," Yasuo Fukui, lead author of one of the research papers, said in the statement. "This is an important step in understanding the formation process of massive star clusters in which galaxy interactions have a big impact."The Small Magellanic Cloud is a dwarf galaxy located 200,000 light-years from Earth.