Studying Space

The time required for the Earth to rotate once on its axis is a(n) (a)   .

The unit that describes the distance that light travels is a(n) (a)   .

A telescope that uses curved mirrors to gather light is called a(n) (a)   telescope.

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What happens in one year?

• The moon completes one orbit around the Earth.

• The sun travels once around the Earth.

• The Earth revolves once on its axis.

• The Earth completes one orbit around the sun.

Invisible radiation (like UV rays and X-rays) cannot be detected by the human eye on Earth. Earth's atmosphere also affects invisible radiation. How might the atmosphere affect invisible light?

• The atmosphere blocks invisible radiation from getting to Earth.

• The atmosphere changes the radiation.

• The atmosphere destroys invisible radiation.

• The atmosphere does not affect invisible light.

Why do stars sometimes appear to move in the night sky?

• Due to the rotation of Earth on its axis

• Due to the movement of the Milky Way galaxy

• Due to the movement of stars in the universe

• Due to the revolution of Earth around the sun

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Which of the following scientists proved that other galaxies existed, paving the way for modern astronomy?

• Galileo Galilei

• Nicolaus Copernicus

• Edwin Hubble

• Sir Isaac Newton

Astronomers divide the sky into ___.

• galaxies

• constellations

• zeniths

• phases

Check all of the following options that determine which stars you see in the sky.

• Your location

• The time of year

• The location of the moon in the sky

• The time of night

The altitude of an object in the sky describes the angle between the object and what other reference point?

• the horizon

• the zenith

• the equator

• the prime meridian