Galaxies
What are the three main galaxies in the universe?
Irregular, Elliptical, Spiral Galaxies
What is a Light year?
The distance light travels in one year.
What is a group of galaxies made of dust,gas and other material?
Universe
What type of force holds all the galaxies together??
Gravity.
How many stars are in the milky way?
There is 200,000 stars in our milky way
How long does it take for sunlight to reach us?
It takes 8.4 minutes for sunlight to reach the Earth.
What is a system of millions or billions stars, made of gas and dust, and held together by gravitational attraction called?
A galaxy.
What type of galaxy is spiral or disc shaped, has arms, and a dense center?
Spiral galaxies.
What is the closest star to our Solar System?
Proxima Centauri, Our "next-door neighbor."
How long does it take for the Sun's light to reach Pluto?
5.5 hours
What is a group of stars?
A cluster.
What type of galaxy has no defined shape, no clear bulge or disk, and is formed by the leftovers of two colliding galaxies?
Irregular Galaxies.
Put the objects in space in order from closest to farthest from the Sun:
Barnards Star - 5.9 years
Pluto - 5.5 hours
Luhman 16 - 6.59 years
Sirius A - 8.58 years
Earth - 8.4 minutes
Order - Closest to Farthest:
Earth
Pluto
Barnards Star
Luhman 16
Sirius A
How fast does light travel in miles per second?
186,000 miles/sec
What is light traveling in a year called ?
Light year
What type of galaxy is the milky way classified as?
Spiral galaxy
How far across is our milky way?
100,000 light years
If Alpha Centauri is 42 trillion km away from us, and a light year is 10 trillion km, how many light years is Alpha Centauri from us?
4.2 light years.
What is the closest galaxy to our Milky Way?
Andromeda Galaxy.
What type of galaxy is oval-shaped, are the most abundant galaxies in the universe, and most are composed of older or low mass stars?
Elliptical galaxies.