Stars, Galaxies and the Universe

The electromagnetic spectrum consists of

• all of the colors of light you can see with your eyes.

• all of the different types of electromagnetic waves.

• a band of colors formed when white light passes through a prism.

• infared and visible light only.

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A range of colors formed when white light passes through a prism is called a

• lens/

• photograph.

• spectrum.

• ray.

Both reflecting and refracting telescopes are designed to

• break visible light into colors of the spectrum.

• separate visible light from ultraviolet and radio waves.

• gather and focus visible light.

• work better with short-wavelength radiation.

Reflecting telescopes use

• three small objective lenses

• two large objective lenses.

• mirrors.

• one large objective lens.

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A light-year is

• 365 days.

• the distance light travels in a year.

• the distance from Earth to Proxima Centauri.

• the amount of light the sun produces in a year.

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Parallax is used to determine a star’s

• distance from Earth.

• temperature.

• composition.

• brightness.

Characteristics used to classify stars include

• distance, size, and color.

• size, distance, and brightness.

• color, brightness, and distance.

• size, brightness, and temperature.

What color are the coolest stars?

• blue-white

• yellow

• red

• orange

A star is born when

• a nebula expands.

• helium and oxygen combine.

• nuclear fusion starts.

• a protostar begins to cool.

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The lifetime of a star depends on its

• temperature.

• absolute brightness.

• mass.

• apparent brightness.

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