A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity. There are billions of them in the universe.
What are galaxies?
100
Universe means...
What is all of space and everything in it?
100
A giant cloud of gas and dust that collapsed and formed our solar system is called this.
What is a solar nebula?
100
True or False
Our Universe is expanding and will likely continue to expand forever.
What is true?
200
Most stars are members of these.
What is star system?
200
Three types of galaxies.
What are spiral, elliptical, and irregular?
200
Scientific notation uses powers of this to write very large or very small numbers in a shorter form. For example: one light year=9,500,000,000,000,000 meters=9.5X10^15 meters.
What is power of 10?
200
The solar nebula was pulled together by gravity and spun faster and faster until the gas eventually became hot and dense enough for nuclear fusion to begin. Then this was born.
What is the sun?
200
This type of matter does not give off electromagnetic radiation.
What is dark matter?
300
Star systems that have this many stars in it are called binary stars.
What is two? bi- means two
300
Active young galaxies with giant black holes at their centers. The Latin meaning is "something like" stars or guasi-stellar.
What is quasars?
300
Astronomers think that the universe began billions of years ago and that the universe started no bigger then the period at the end of this sentence. Then this happened.
What is the big bang?
300
Planetesimals were small asteroid-like and comet-like bodies that collided and grew larger by sticking together and eventually formed these.
What is planets?
300
True of false
Dark matter can be seen directly.
What is false?
400
A system in which one star periodically blocks the light from another is called this.
What is an eclipsing binary?
400
Our solar system is located in the spiral galaxy called this.
What is Milky Way? Like the candy bar!
400
Edwin Hubble created a theory that became a scientific law called Hubble's Law. It states this.
What is that the farther away a galaxy is the faster it is moving away from us?
400
The inner planets, or terrestrial planets, may have all had this on their surface. Our planet is now the only one that has any left on it's surface.
What is water?
400
This astronomer discovered and proved the existence of dark matter.
What is Vera Rubin?
500
The two types of star clusters.
What is open clusters and globular clusters?
500
The astronomers study the center of the Milky Way using these three things.
What are X-rays, infrared radiation, and radio waves?
500
This is leftover thermal energy from the big bang. It results in a mysterious glowing light in space.
What is cosmic background radiation?
500
The outer planets are made of these two gases.
What is hydrogen and helium?
500
This is said to be causing the expansion of the universe, and what is causing it to accelerate.