Astronomy Part 2

Which sequence correctly lists the relative sizes from smallest to largest?

• our solar system, universe, Milky Way Galaxy

• our solar system, Milky Way Galaxy, universe

• Milky Way Galaxy, our solar system, universe

• Milky Way Galaxy, universe, our solar system

Most scientists believe the Milky Way Galaxy is

• spherical in shape

• 4.6 billion years old

• composed of stars revolving around Earth

• one of billions of galaxies in the universe

When viewed from Earth, the light from very distant galaxies shows a red shift. This is evidence that these distant galaxies are

• revolving around the Sun

• revolving around the Milky Way

• moving away from Earth

• moving toward Earth

• 1

• 2

• 3

• 4

The explosion associated with the Big Bang theory and the formation of the universe is inferred to have occurred how many billion years ago?

• less than 1

• 4.6

• 2.5

• over 10

The reaction below represents an energy-producing process. The reaction represents how energy is produced

• in the Sun by fusion

• when water condenses in Earth’s atmosphere

• from the movement of crustal plates

• during nuclear decay

Which statement describes the general relationship between the temperature and the luminosity of main sequence stars?

• As temperature decreases, luminosity increases.

• As temperature decreases, luminosity remains the same.

• As temperature increases, luminosity increases.

• As temperature increases, luminosity remains the same.

Which object forms by the contraction of a large sphere of gases causing the nuclear fusion of lighter elements into heavier elements?

• comet

• star

• planet

• moon

The diagram below represents the development of our universe from the time of the Big Bang until the present. Letter A indicates two celestial objects. The present-day celestial objects labeled A are best identified as

• asteroid belts

• spiral galaxies

• terrestrial planets

• eccentric comets

Cosmic background radiation provides direct evidence for the origin of

• the universe

• our solar system

• Earth’s ozone layer

• Earth’s earliest atmosphere