Stars, Galaxies, and Formation of the Universe

What type of star is the Sun?

• Red giant
• White dwarf
• Red supergiant
• Main sequence

The HR diagram classifies stars based on their surface temperature and their:

• color
• diameter
• distance from Earth
• absolute brightness

Which one of these is considered evidence in support of the big bang theory?

• stars
• electromagnetic spectrum
• cosmic background radiation
• Hubble telescope

When did the big bang occur?

• 5 million years ago
• 4.6 billion years ago
• 13.8 billion years ago
• 100 billion years ago

What determines if a star becomes a white dwarf, neutron star, or a black hole?

• Its age
• Its mass
• Its brightness
• Its temperature

What color are the coolest stars?

• blue-white
• yellow
• orange
• red

The Milky Way is what type of galaxy?

• Spiral
• Elliptical
• Irregular

What is a light-year?

• distance between two stars
• distance light travels in one year
• the time it takes light to travel 300,000,000 meters
• the time it takes light to travel to Earth from the Sun

Which correctly orders the items from smallest to largest?

• Universe, Galaxy, Star Cluster, Star
• Star, Star Cluster, Universe, Galaxy
• Star, Star Cluster, Galaxy, Universe
• Star, Galaxy, Star Cluster, Universe

The surface temperature of main sequence stars increases as the

• diameter increases
• diameter decreases
• absolute brightness increases
• absolute brightness decreases