Solar Systems
Earth, other planets, moons, asteroids, and other objects orbiting the sun form this.
Solar System
Groups of 2 or more stars.
Star systems
Huge group of solar systems, star systems, star clusters, dust, and gas bound together by gravity.
Galaxies
There are about this many galaxies in the universe.
Billions
Grouping of stars that is disorganized.
Open Cluster
Most of these have planets, asteroids, comets, and other objects orbiting around them making each a unique solar system.
Stars
Star systems that have exactly 2 stars.
Double or binary stars
The solar system we live in.
Milky Way Galaxy
Tiny particles that make up stars.
Atoms
Large groupings of older stars.
Globular Clusters
Distance light travels in about one year.
Light-year
Groups of 3 or more stars.
Multiple Star Systems
Appear to have a bulge in the middle and arms that spiral outwards like pinwheels.
Spiral Galaxy
The apparent motion of an object against distant background stars.
Parallax
It takes about this long for the light from the Milky Way to reach the Earth.
25,000 years
This is the sun centered solar system identified by Galileo.
Heliocentric
Larger groupings of stars.
Clusters
Rounded galaxies that may be elongated and slightly flattened to varying degrees.
Elliptical Galaxy
Used to measure distances in space.
Astronomical Unit (AU)
Closest galaxy to the Milky Way.
Andromeda
All of the planets are this shape.
Sphere
All of the stars in a particular cluster formed from this same thing.
Nebula
Galaxies with no regular shape.
Irregular Galaxies
There is no end to the universe. (True or False)
True
When small, dim star passes in front of the larger and brighter star, it blocks some of the brightness of the larger star.
Eclipsing Binary