Astronomy

Astronomer to propose the heliocentric model of the solar system.

Imaginary line around which Earth rotates. Earth has a tilt of 23.5° which helps create seasons

This is the path which one body follows around another body in space.

Theory that the universe was created about 4 to 5 billion years ago from expanding matter.

Part of the Earth's stratosphere which contains relatively high concentrations of O₃.

This is the Sun and the celestial objects bound to it by gravity.

Astronomer who found speed of gravity, discovered Jupiter's moons, and improved the telescope.

This is when a phase of the moon appears to be getting larger.

This is the complete elliptical orbit of the Earth around the Sun.

This is all matter and energy

the period of time it takes for earth to make a complete rotation on its axis

This is a phase of the moon where the moon appears to be getting smaller.

The appearance of the illuminated portion of the Moon as seen by an observer, usually on Earth.

This is when the Moon is positioned directly opposite the Sun.

The lunar phase when the lit portion of the Moon is greater than half but not a full Moon.

The spinning of our planet on its axis, takes 24 hours and is responsible for day and night.

A massive, gravitationally bound system consisting of stars, gas and dust, and dark matter. 

This is a natural satellite that orbits a planet or smaller body, which is called the primary.

This is a large, rocky body found in space, orbits the sun in a belt between Mars and Jupiter.

When a meteoroid or asteroid enters Earth's atmosphere and becomes visible.

This is when you see just a thin sliver of the moon.

When the Moon passes between the Sun and the Earth, the Sun is partially/completely obscured. 

Lunar phase that occurs when the Moon lies between Earth and the Sun, the Moon is not visible

This is the model of the solar system with the sun at the center.

When the Moon passes through the Earth's shadow, only when the Sun, Earth, and Moon are aligned

An object which orbits around another celestial body in space, can be natural or artificial.

"Dirty Snowball" that orbits the Sun and when close to the sun exhibit a small tail of ice.

This is one of billions of galaxies in the observable universe and it is our home galaxy.

The different layers of gases that extend from the surface of the Earth into space.

This is a scientific conclusion based on much supporting evidence.