Science Earth&Space

A galaxy which is either spherical (ball like) or a flattened disk is a ___ galaxy.

• elliptical

• humanoid

• irregular

• spiral

A galaxy which has a nucleus of bright stars and two or more arms in circular formation is called a ___ galaxy.

• elliptical

• humanoid

• irregular

• spiral

A Group of stars, and or star systems, star clusters, dust and gas held together by gravity is known as:

• Universe

• Galaxy

• Solar System

• Planet

An explosion that occurs at the end of a stars life cycle is known as:

• Superior Star

• White Dwarf

• Supernova

• Neutron star

Sequence the following events in proper order: planets form, planetesimals form, solar nebula shrinks, nuclear fusion begins in the sun.

• 1. planets form 2. nuclear fusion begins in the sun 3. planetesimals form 4. solar nebula shrinks

• 1. solar nebula shrinks 2. nuclear fusion begins in the sun 3. planetesimals form 4. planets form

• 1. nuclear fusion begins in the sun 2. planets form 3. planetesimals form 4. solar nebula shrinks

• 1. planetesimals form2. planets form 3. nuclear fusion begins in the sun 4. solar nebula shrinks

Which type of galaxy is not a major galaxy?

• Elliptical

• Spiral

• Quasar

• Irregular

How many years ago did the universe form according to the Big Bang?

• 13.7 billions of years ago

• 30.7 billions of years ago

• 15.6 billions of years ago

• 16.5 billions of years ago

How many main sequence stars is in our solar system?

• 2

• 8

• 1

• None

Which of the following correctly places these in order from LARGEST to SMALLEST?

• galaxy -- local group/cluster -- planet -- solar system -- universe

• universe -- local group/cluster -- galaxy -- solar system -- planet

• planet -- solar system -- galaxy -- local group/cluster -- universe

• universe -- galaxy -- solar system -- local group/cluster -- planet

It takes the Sun 225-250 million years to do one revolution of the Milky Way Galaxy. How fast does the Sun travel?

• 220km in a minute

• 220km in a second

• 220km in a year

• 220 km in an hour