Planets
Astronomical phenomena
Space exploration
Earth
Galaxies and Universes
100

What is the closest planet to the sun

Mercury

100

What is a solar eclipse

Occurs when the moon passes between the earth and sun

100

Who was the first human to walk on the moon

Neil Armstrong

100

Earth orbits around this object

The Sun

100

What is the milky way

The galaxy we live in

200

Which planet is the largest

Jupiter

200

What is a lunar eclipse

Occurs when the earth passes between the moon and sun

200

What does NASA stand for

National Aeronautics and Space Administration

200

How long does it take for earth to complete a full orbit around the sun

365 days

200

What are stars

Objects held in place by self gravity

300

How many planets are in the solar system

8

300

What is a constellation

A group of stars that make a shape or picture in the sky

300

What is a rover

A robot that explores the surface of planets for the use of research

300

What is gravity

Invisible force that keeps moon in orbit around the earth

300

What is the big bang theory

The idea that the universe started from a tiny dense point

400

What is the 6th planet from the sun

Saturn

400

What are moon phases

When the moon slowly changes shape over a month

400

What is the International Space Station (ISS)

A lab orbiting the earth which is shared by astronauts from many countries
400

Earth is the _ planet from the sun

3rd

400

What are galaxy clusters

These are huge groups of galaxies held together by gravity

500

What are the characteristics of an outer planet

Large size, Gaseous, Numerous moons 

500

What is a solar flare?

A sudden powerful burst of energy from the sun that can affect satellites and power grids.

500

What is a space shuttle

A vehicle that carries astronauts into space

500

What is the atmosphere

The layer of gases surrounds earth and protects it from harmful space radiation.

500

What is dark energy

Mysterious force that is causing a universe to expand faster over time