Star Systems
What is a star system?
A huge group of single stars, star systems, star clusters, dust and gas bound together by gravity.
What is a galaxy?
How long ago did the universe begin?
13.7 billion years ago
What is dark matter?
Matter that does not give off electromagnetic radiation
In a binary star, the smaller star is called ___
the dim star
Galaxies that appear to have a bulge in the middle with arms that spiral outward.
Spiral galaxies
What is the name of the galaxy we live in, and what is its type?
We live in the Milky Way galaxy, and it is a spiral galaxy
Name ONE of the possibilities that will happen to the universe in the future.
1. The universe will continue to expand, and all stars will burn out, resulting in a cold and dark universe.
2. The force of gravity will begin to pull the galaxies back together resulting in an enormous black hole.
A star system with three stars.
Triple Star
Galaxies that contain billions of stars but have little gas and dust between the stars.
Elliptical Galaxies
According to the __________, the universe formed in an instant, billions of years ago, in an enormous explosion.
Big Bang Theory
Who discovered dark matter?
Vera Rubin
As the companion star revolves around the brighter star, the companion star's gravity causes the bright star to ___
Wobble
Galaxies that do not have regular shapes
Irregular galaxies
According to ________, the farther away a galaxy is, the faster it is moving away from us.
Hubble's Law
Astronomers infer that a mysterious new force, which they call ____, is causing the expansion of the universe to accelerate.
dark energy
A system in which one star blocks the light from another periodically.
What is an eclipsing binary
Active young galaxies with huge black holes at their centers.
Quasars
The leftover thermal energy from the big bang is called _____.
cosmic background radiation
Which of the two future universe possibilities is more likely to happen?
Astronomers conclude that the universe will likely expand forever