Ch. 18 Test

He created a sun centered theory of the universe

• Newton

• Brahe

• Galileo

• Copernicus

He showed that gravity keeps planets and moons in orbit

• Kepler

• Galileo

• Newton

• Ptolemy

He proved that there are many galaxies

• Copernicus

• Hubble

• Galileo

• Newton

He created an Earth-centered theory of the universe

• Ptolemy

• Copernicus

• Galileo

• Newton

He showed that planets move in elliptical orbits around the sun

• Ptolemy

• Galileo

• Kepler

• Copernicus

He was one of the first astronomers to use a telescope to observe objects in space

• Galileo

• Ptolemy

• Copernicus

• Hubble

What does a telescope collect from space and focus for closer observation?

• magnetic particles

• electromagnetic radiation

• lenses

• mirrors

How did Hubble tell the universe was expanding?

• Galaxies were moving away from each other.

• Galaxies were moving toward each other.

• Galaxies were getting bigger.

• The number of galaxies was increasing.

Which of the following indicates the universe is expanding?

• A growing celestial sphere

• An increase in the number of constellations in the sky

• The discovery of other galaxies

• Observations of redshift

What is an advantage of a reflecting telescope?

• It can gather more light

• It can focus images perfectly

• It can detect distant objects

• It can use very small lenses