Chapter 21 Flashcard- Intro. To Astronomy

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

What is the shape of a planet's orbit?

Who proposed the sun-centered solar system?

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

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

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

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

What is the primary reason for the seasons on Earth?

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

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