Chapter 21 Flashcard- Intro. To Astronomy

Front

Who was the first scientist to use the telescope to study planets and stars?

Back

Galileo

Front

What is the shape of a planet's orbit?

Back

An ellipse

Front

Who proposed the sun-centered solar system?

Back

Copernicus

Front

What is the term for the phase of the moon when it is increasing in size from new to full?

Back

Waxing

Front

What is the term for the phase of the moon that occurs when it is half illuminated and increasing in size?

Back

First Quarter

Front

What is the term for the phase of the moon that occurs when it is half illuminated and decreasing in size?

Back

Last Quarter

Front

What is the name of the effect that causes the apparent shift in position of stars due to the Earth's movement?

Back

Parallax

Front

What is the primary reason for the seasons on Earth?

Back

The tilt of the Earth's axis

Front

What is the name of the force that keeps planets in orbit around the sun?

Back

Gravity

Front

What is the term for the time it takes for the moon to complete one full cycle of phases?

Back

Lunar month