Home https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Science https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Earth was on the other side of the galaxy when dinosaurs reigned

Earth was on the other side of the galaxy when dinosaurs reigned

For the past decade, Christiansen has studied the frequency of the planet's occurrence or how often and what kinds of planets are encountered in the galaxy as he examines extraterrestrial hunting data such as NASA's Kepler, K2, and TESS missions.

During a stellar party review at the California Institute of Technology, Christiansen explained how young the stars they were watching. Sky watchers watched the Pleiades, a bright young bunch of stars who are some of the youngest in our sky.

They are 13 million years old, which sounds ancient. Christiansen wanted to convey this astronomically, this is still a young age.

She told her fellow star stars that before they disappeared, dinosaurs would not even see these stars in the sky because they did not exist until millions of years after the event of extinction. And she told them that when dinosaurs roamed the Earth as our stegosaurus, our entire solar block was on the Milky Way opposite to the galaxy as it is now.

Kristiansen does not share new information, she said. But the fact caught everyone's attention because the motion of our solar system as it travels around the galaxy is not something that most people think about.

"You don't think about changing the sky," Christiansen said. "But the stars come and go, keeping up with our timing charts."

For a while, she wanted to create an animation of this intriguing idea, and the stars' response inspired her one night after her children had gone to bed. Using the classic illustration of the Milky Way, as seen from above, by Kaltech senior scientist Robert Hurt, Christiansen created the animation using time slides in PowerPoint. Then she shot the screen to create a video she could share on Twitter.

She wanted to share the idea that, although astronomical time charts were significantly different from our own, they actually coincided quite well with archaeological clocks.

  The center of the Milky Way exploded when ancient human ancestors circled the Earth [1<div class="e3lan e3lan-in-post1"><script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
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</script></div>9659010] The center of the Milky Way exploded when ancient human ancestors circled the Earth

The sun is required to move anywhere between 200 and 250 million years the center of the galaxy, a grand spiral that encloses a dangerous environment that would be inhospitable to life.

Based on our current position in the galaxy and the time ranges shared in the animation, we have essentially completed the orbit of it.

The last time our solar neighborhood was in this part of the galaxy, relatively speaking, the earliest dinosaurs began to appear on Earth during the Triassic period. The Jurassic period then lasted 55 million years, followed by the Cretaceous period, which continued until the dinosaurs disappeared 65 million years ago.

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[1965] such as the Stegosaurus, the Iguanodons, and the Giganotosaurus lived through the early Cretaceous while Earth was on the other side of the galaxy. The long 79 million year period of the Cretaceous has largely happened there. To put things in perspective, Tyrannosaurus Rex exists on Earth when it is in a part of the galaxy that is closer to our current state than many other dinosaurs.

The extinction event 65 million years ago was followed by the rise of mammals and we are still in this "phase", so to speak. At the end of the animation, Christiansen offers an intriguing question: What will be on the planet next time we complete another orbit?

  This violent galaxy in the neighborhood is set to collide with the Milky Way

Christian animation, but explained some of the more complex science behind this orbit.

While astronomers are still learning how stars revolve around the center of the galaxy, ultimately everything in our galaxy revolves around the black hole at its center. The stars closer to the center rotate faster, while those in the outer regions rotate more slowly. Our solar system is in one of the spiral arms of the galaxy and the whole arm orbits around the galaxy, including the other stars in our "neighborhood," Christiansen said.

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and the Milky Way galaxy itself moves toward its large neighbor, the Andromeda Galaxy. The two are in a clash and will come together in about 4 billion years. Although this sounds violent, galaxies are largely empty space and the stars will not collide with each other, Christiansen said.

So, relatively speaking, we're going back to where we were 200 to 250 million years ago. But based on our orbit on the Milky Way, which itself moves and spirals, we never return to the same absolute point in space, because that is not possible.

"The simple idea that I was trying to overcome is that astronomy has certain time intervals, and archeology has them, and sometimes they coincide. Isn't it cool? "

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