Unit 1.2 The Universe Review

What type of galaxy is this?

• Spiral

• Elliptical

• Irregular

what type of galaxy is this?

• Spiral

• Elliptical

• Irregular

What type of galaxy has no defined pattern or shape?

• Spiral

• Elliptical

• Irregular

What are galaxies held together by?

• Gravity

• Dust and gas

• Stars

• Other galaxies

The closest star to the sun is the...

• Sirius A

• Betelgeuse

• Barnard's Star

• Proxima Centauri

Place these objects in order from smallest to largest.

• Planets, solar system, universe, galaxy

• Solar system, planets, galaxy, universe

• Planets, solar system, galaxy, universe

• Galaxy, solar system, planets, universe

What is the unit of measurement used by astronomers for very distant objects.

• kilometers

• lightyears

• light minutes

• miles

What is 1 Astronomical Unit?

• The distance from the center of the earth to the center of the sun.

• The distance from the center of Earth to the center of the Moon.

• The distance of one entire revolution around the Sun by the Earth.

• The distance Light travels in a year.

When we look at images of astronomical bodies are we looking at them in the present?

• Looking at current images of distant astronomical bodies is like looking back in time; the light that we see does not show what the object looks like now but how it looked when the light was emitted.

• Looking at current images of distant astronomical bodies is like looking forward in time; the light that we see does not show what the object looks like now but how it will look when our galaxies align.

• Looking at current images of distant astronomical bodies is like looking at a our current point in time; the light that we see shows what the object looks like now.

Visible light emitted from a star or galaxy can be separated into a band of colors, called a ________.

• Spectrum (or spectral lines)

• Microwave

• Radiation