els L2

What is a galaxy?

• A planet orbiting a star

• A single star in the universe

• A group of stars, dust, and gases held together by gravity

• A cluster of asteroids

What percentage of galaxies are classified as elliptical galaxies?

• 30%

• 50%

• 60%

• 10%

What is the Milky Way Galaxy?

• A cluster of galaxies

• An elliptical galaxy

• A small irregular galaxy

• A large spiral galaxy

What does red shift indicate?

• Stars are dying

• Galaxies are moving closer together

• The universe is contracting

• The universe is expanding

What is the main component of stars?

• Hydrogen and helium

• Oxygen

• Iron

• Carbon

What is the Hertzsprung-Russell Diagram used for?

• To track the movement of planets

• To measure distances in space

• To classify galaxies

• To show the relationship between absolute magnitude and temperature of stars

What is a supernova?

• A star cluster

• A black hole

• A massive explosion of a star

• A type of galaxy

How many constellations are there?

• 75

• 50

• 100

• 88

What is the life cycle stage after a protostar for a low mass star?

• Black dwarf

• Supernova

• Red giant

• Main sequence

Which type of star is cooler and appears red?

• Giant

• Supergiant

• Red star

• Dwarf