earth science #7

how many different galaxies can we see from earth

• 10

• 9

• 15

• 100

our sun is a ?

• super nova

• sun

• bright

• star

what is the sun mostly composed of ?

• hydrogen and oxygen

• hydrogen and helium

• oxygen and helium

• hydrogen, helium and oxygen

what reaction causes the sun to give off energy?

• magnitude

• sun

• nuclear fusion

• raydon

what is the study of the stars called?

• the study of stars

• astroearth

• star study

• astronomy

how long has the sun produced energy?

• 1 million years

• 150,000 years

• 300 years

• 300 million years

how long will the sun continue to produce energy?

• 14 billion years

• a life time

• as long as it can

• 4 billion years

what two things effect the apparent magnitude?

• brightness and depth

• life and length

• distant and brightness

• distant and length

what is a nebula?

• a gas bubble

• a cloud of gas

• dust

• a inner planet

what is a red giant?

• a baby star

• a small star

• a black hole

• a large star