Show:
planets
the sun
the moon
miscellaneous
Statistics
100
This is the planet that is closest to the sun.
What is Mercury?
100
The sun is the center of this system.
What is the solar system?
100

This is the length of one revolution of the moon around Earth.

29.5 days

100
This moon phase occurs when the moon is between the earth and sun so that the dark side of the moon faces earth.
What is the new moon phase?
100

The tilt of the Earth is this.

23.5 degrees

200
This is the 3rd planet from the sun.
What is earth?
200

The sun is a type of this celestial object that gives off light and heat.

What is a star?

200

This is how the moon formed.

A protoplanet crashed into Earth and debris resulting made a moon.

200
When the sun light shines on more and more of the moon, we say that the moon is doing this.
What is waxing?
200

This is why we do not have monthly lunar and solar eclipse.

Moon's orbit is at a 5 percent tilt., so it doesn't line up exactly.

300
This is what all the planets have in common?
What is "they revolve around the sun?"
300
It takes the earth 365 days to do this.
What is revolve (orbit) around the sun?
300
The moon's gravitational pull causes this rise and fall of the ocean.
What are tides?
300

This is the theory for the beginning of the Universe 14 billion years ago.

Big Bang theory

300

This is the time needed for the Sun to grow into a Red Giant from now.

5-6 billion years

400
These are the rocky planets.
What is Mercury, Venus, Earth, and Mars?
400
This is how long it takes earth to complete one rotation.
What is 24 hours --or one day?
400
These are the apparent shapes of the moon.
What are phases?
400
These two things cause the earth to experience seasons.
What is the tilt of the earth and its revolution around the sun?
400

These planets would be vaporized by the dying Sun.

Mercury and Venus and perhaps Earth

500
These are the gas giants.
What are Jupiter, Saturn, Uranus, and Neptune?
500

The zone needed for planets to have liquid water near a star.

Habitable zone

500

Name six planets in our Solar system with moons.

Earth, Mars, Jupiter, Saturn, Uranus, Neptune

500

In this phase, the moon is described as looking like the left 2/3rds lighted. 

waning gibbous moon

500

How does Kepler Space telescope help scientists?

It helps them discover exoplanets by transits of planets over stars.