Definition
What is a star system that have two stars?
Binary stars
What is the name for our Star System?
Solar System
What is called the name of the center of a star?
Core
all of space and everything in it.
Quasars
objects that are very bright but also very far.
What is called a Star System that have two star?
Binary Star System
What type of galaxy is the Milky Way?
Spiral galaxy
describe the universe.
enormous, almost beyond imagination.
What is the fourth state of matter?
Plasma
How can astronomers tell that there is a dim star in a binary system?
Name the main types of galaxies.
Spiral, Elliptical and Irregular
What is Scientific notation used for?
to describe sizes and distances in the universe.
Star Clusters
stars belonging to a larger grouping.
A system in which one star periodically blocks the light from another.
What type of galaxy ONLY contains OLD stars?
Elliptical galaxies
How long average mass stars like our Sun live?
billions of years.
Describe scientific notation.
uses powers of ten to write very large or very small numbers in shorter form.
Since 1995 how many planets have been discovered around other stars?
100 planets
What does the spiral arm consist of?
3x1016 m