Thanks for inspiring me! I will always use this website for my homework and my research. And I will even tell my classmates and teachers about this website, Bye! Jan 29, Woah there jeff, that's a pretty big mistake. May 23, Thanks for stopping by, just another human. We appreciate you. Abigail Jan 29, Thanks for having our back, Abigail! You're a great Wonder Friend. Everyone is allowed an opinion.
Dec 27, Minh Feb 21, I thought other things are cool, too. Feb 26, Space really is awesome! Justyna Nov 13, I would say the answer is by using a spacecraft would you say that is correct? Nov 16, Ernest Sep 18, Sep 20, Johan May 9, Apr 4, You tell us, Michael! Feb 6, Jan 11, Jan 5, Dec 20, That's terrific news, lyssa!
Leah Nov 4, Zorn Dec 5, Dec 5, We're glad to hear this Wonder was helpful to you, Zorn! Thank you for using Wonderopolis! Nov 4, Mariam Nov 4, It's great to hear this helped you, Mariam! TayeDaBoss10 Oct 24, Oct 25, We're glad to hear you enjoyed this Wonder, TayeDaBoss10! Thanks for commenting. Shivi Jun 1, Jun 1, Great to hear, Shivi! We're glad this Wonder was helpful! Visit again soon! Natalie May 21, May 24, Carson Shoener May 9, I want to know the author of this wonder of the day for my research paper bibliography.
Thanks for having this though it was very helpful. May 11, Mar 21, Enderpro 13 Mar 9, Thank you for the information on my scientific article. Mar 11, You're very welcome, Enderpro! Thank YOU for stopping by Wonderopolis to find information!
Enderpro 13 Mar 14, Mar 16, Thanks for stopping back by Wonderopolis, Enderpro! I'm using this for class and its amazing wow helps a lot. Skylar Feb 24, Feb 25, We're glad you liked it, Skylar! Thanks for stopping by Wonderopolis! James Dec 15, This is cool we are useing this article for class. Dec 16, We hope it is helpful! Nicole Oct 22, Oct 24, Hi, Nicole! That's right! This World explores the many worlds in our solar system! Eria Jan 12, Wonderopolis Jan 14, Leony May 22, Dear wonderopolis Thank you for this wonder it was so cool that there is over a hundred billion galaxies.
I hope that the next wonder is about that do worms sleep? Wonderopolis May 23, We love space. We are reading about the solar system in reading, and we are doing a project on mercury in science. Enderpro 13 Mar 22, I'm reading about our solar system as well.
Mar 23, We hope you're having fun and learning lots of cool information! Wonderopolis Feb 21, Emily Jan 26, Hi, Wonderopolis. I love going on this website to learn many interesting facts. It is so fun that I have to get on this website more. Keep up the Wonders! Wonderopolis Jan 27, Jake Jan 23, Wonderopolis Jan 23, We are so glad, Jake! I love space and I wish it was possible to travel to other galaxies.
I love these facts. I learn so much every time!!!! TONI Jan 23, At first it was hard to get to the website, but when I did it turned out to be really great! I loved when the video showed the sun having a storm.
Thanks for sharing that with me!!! This website is awesome!!!! You are so welcome, Jake! Thank you for the amazing facts about the solar system, and I wish we go to outer space every other days. You are so welcome, Jacob! We wish we could go to space, too! Evan Jan 23, You wonder people must love space. I kinda do. I like penguins more than space, but that is awesome!!! I love Wonderopolis. I've only seen a few wonders, but I hope there will be more. French Riviera Yacht Charter. Private Charter Nassau Bahamas.
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If the stars and gas that we can see inside galaxies are only a small portion of their total mass, then the velocities make sense. Astronomers nicknamed this unseen mass dark matter.
Yet, in the nearly 40 years that followed, researchers still haven't been able to figure out what dark matter is made of. A popular hypothesis is that dark matter is formed by exotic particles that don't interact with regular matter, or even light, and so are invisible.
Yet their mass exerts a gravitational pull, just like normal matter, which is why they affect the velocities of stars and other phenomena in the universe. However, try as hard as they might, scientists have yet to detect any of these particles, even with tests designed specifically to target their predicted properties.
Still, many hold out hope that we're getting close and that experiments such as the newly built Large Hadron Collider particle accelerator in Geneva may finally solve the puzzle. Dark energy is possibly even more baffling than dark matter. It's a relatively more recent discovery, and it's one that scientists have even less of a chance of understanding anytime soon. It all started in the mids, when two teams of researchers were trying to figure out how fast the universe was expanding, in order to predict whether it would keep spreading out forever, or if it would eventually crumple back in on itself in a "Big Crunch.
To do this, scientists used special tricks to determine the distances of many exploded stars, called supernovas, throughout the universe. They then measured their velocities to determine how fast they were moving away from us.
When we view very distant stars, we are viewing an earlier time in the history of the universe, because those stars' light has taken millions and billions of light-years to travel to us.
Thus, looking at the speeds of stars at various distances tells us how fast the universe was expanding at various points in its lifetime.
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