Maheswari

Definition:

A 1950s British science fiction radio drama about astronauts traveling into space and facing adventures and dangers.

When did it happen?

• First aired in 1953.

• It was before humans went to space.

Key Points:

Definition:

The 400 years of astronomy is the time since 1609 when scientists began using telescopes to study space and made many important discoveries about planets, stars, and galaxies.

Key Points:

• Telescopes began being used in 1609 by Galileo Galilei

• The heliocentric model was accepted

• Planets move in elliptical orbits.

Geocentric Model:

Geocentric means “Earth-centered.”

This model said:

• Earth is at the center of the universe.

• The Sun, Moon, and planets move around Earth.

This idea was supported by:

What is the Moon?

The Moon is a big round space rock orbits the Earth.

Key Points:

• The Moon does not make its own light.

• It reflects sunlight.

• It takes about 27 days to go around Earth once.