Planet Information
Easy facts
Atmosphere
Vocabulary
100
How many moons does Mercury have?
None.
100
Mercury is the hottest planet. True/False
False: It is the second hottest planet.
100
What is the daytime temperature of Mercury?
Sizzling 800 °F
100
A spacecraft that travels without a person inside.
Unmanned spacecraft
200
How long is a year on Mercury?
88 Earth Days
200
How many spacecraft have visited Mercury?
Only 2
200
What is the temperature on Mercury on its side facing away from the Sun?
-290°F
200
Planets that are not solid, but instead are made of gas.
Gaseous
300
How long is a day on Mercury?
59 Earth days
300
Mercury has a thick atmosphere.
True/False
False.
300
What is the color of the sky on Mercury?
Always dark, as there are no air particles to scatter the light waves.
300
Rocks that orbit in space, sometimes crashing int planets and other satellites.
Asteroids
400
What is another name for a rocky planet?
Terrestrial planet
400
Mercury is the smallest planet.
True/False
True
400
What is the color of the Sun if you were standing on Mercury?
White
400
The first spacecraft sent to Mercury in 1973.
Mariner 10
500
What is Mercury's distance from the Sun?
36 million miles
500
The scars on Mercury's surface are called asteroids.
True/False
False. They are craters caused by asteroids.
500
Why is Mercury the most cratered planet?
No atmosphere to burn up the meteors.
500
The second spacecraft sent to Mercury in 2004.
Messenger