A galaxy is a massive group of stars, star clusters, interstellar gas and dust, and dark matter which is all gravitationally bound together. The word 'galaxy' is derived from the Greek word galaxias which means "milky", it is a reference to our own galaxy the Milky Way. There are potentially more than 170 billion galaxies in the observable universe. Some, called dwarf galaxies, are very small with about 10 million stars, while others are huge containing an estimated 100 trillion stars. Based on shape astronomers have identified various kinds of galaxies including, elliptical galaxies, spiral galaxies, lenticular galaxies and irregular galaxies Supermassive black holes are believed to sit at the center of most galaxies. Galaxies often collide with each other. Usually, the stars within each will move past one and other due to the vast space between them. Any gas clouds and dust will interact, forming new stars. Gravity can pull the galaxies into new shapes, two spiral galaxies might join into a new elliptical, others produce bars, rings, or tails. Just. Amazing.
31 Comments
Brady
2/7/2017 03:31:57 pm
Whoa! That's cool!
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jenna
2/8/2017 08:18:24 pm
that is amazing. i am so excited to work on our book!!!
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Katelyn Ashton
2/7/2017 03:51:02 pm
The elliptical galaxy looks like cinnamon floating in water
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Annika
2/7/2017 07:38:00 pm
I can totally see that.
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Paige
2/7/2017 04:34:33 pm
Wow galaxies are more interesting than I thought!
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addieJ
2/7/2017 04:39:38 pm
cool pics
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parker
2/7/2017 04:59:35 pm
so cool
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Tabitha
2/7/2017 05:11:47 pm
The barred spiral is definitely my favorite.it looks like an eye.
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2/7/2017 05:15:08 pm
wow galaxies are really cool looking!!! like the pics!!!;):);)
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Tyler
2/7/2017 05:18:10 pm
The lenticular galaxy looks like an eye.👀
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Caden
2/7/2017 05:59:25 pm
Cool
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jenna
2/7/2017 06:35:15 pm
wow amazing
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Emmalee
2/7/2017 07:11:55 pm
AMAZING PICS!!!!
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Annika
2/7/2017 07:36:56 pm
This lesson is awesome. I love the images. Especially the one that shows the types of galaxies.
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sydney
2/8/2017 06:34:50 pm
My favorite galaxy is a spiral
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Zane
2/7/2017 09:13:55 pm
Galaxies are just so cool. :D :D :D :D it's SO AWESOME
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Zane
2/7/2017 09:15:29 pm
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Avery
2/8/2017 07:16:01 am
I like the Lenticular spiral because it is super bright in the middle then kind of foggy on the outside!
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Zaya
2/8/2017 07:27:31 am
THAT IS AMAZING
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Stephanie
2/8/2017 07:37:47 am
I love the facts!the pictures are amazing
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addie J
2/8/2017 04:44:42 pm
this lesson is super cool!
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Katelyn Ashton
2/8/2017 05:14:40 pm
Some galaxies look like mini explosions of color.
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Kylie
2/8/2017 05:56:44 pm
Wow! That's AMAZING!
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brady
2/8/2017 08:15:59 pm
the second to last pic is really cool
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2/8/2017 08:19:00 pm
not funny guys that is stupid how much space you are taking
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Zaya
2/9/2017 07:36:41 am
I think galaxies are amazing and are very beautiful!
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Stephanie
2/9/2017 07:38:17 am
This stuff is cool...but hard to explain to kindergarteners 😂😂😂
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Alivia Murie
2/9/2017 08:13:56 am
so cooooooooooooool
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sammi the awesome
2/9/2017 10:37:48 am
OH MY GOSH!!!!! DO YOU REMEMBER ME MRS. TAY TAY
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Mrs. Taylor
2/9/2017 11:12:39 am
Hi Sammie, I'll never forget you! Glad you are loving your life :) Work hard and rock that science class!!! (You go girl!)
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Mrs. TaylorI love science! Everything about the world is interesting and never boring. I love to study plants, animals, insects, and people. My favorite subjects are my students who are the most unique organisms on the planet! Categories |