History of Astronomy and Space Travel

Front

Who suggested elliptical orbits for the planets?

Back

Johannes Kepler

Front

What occurs when Earth is positioned between the moon and the sun?

Back

Lunar Eclipse

Front

What is the average sun-to-earth distance called?

Back

An Astronomical Unit

Front

Why do we see phases of the moon during a month?

Back

We see only the lit part of the moon as it moves around Earth.

Front

What problem did early astronomers face with the geocentric model?

Back

Retrograde motion of planets farther out than the Earth.

Front

What is the term for the apparent backward motion of planets?

Back

Retrograde motion

Front

What is a Solar Eclipse?

Back

An event where the moon passes between the Earth and the sun, blocking the sun's light.

Front

What is a Lunar Eclipse?

Back

An event where the Earth is positioned between the sun and the moon, causing the Earth's shadow to fall on the moon.

Front

What is the significance of the Astronomical Unit?

Back

It is a standard unit of measurement used to describe distances within our solar system.

Front

What did the geocentric model propose?

Back

That the Earth is at the center of the universe and all celestial bodies revolve around it.