Many plants and animals live on our planet's ______.
surface
There is a big _______ between the sun and Earth.
distance
The _____ of the earth is 1,800 miles below the surface.
core
Without ______, people on Earth would float into the air.
gravity
The _______ is a ________ and mysterious place.
universe
The Earth is _______ because it has _______ ________.
unique, living creatures
You can see the moon's ______ with a ________.
craters, telescope
What is a speck of bright light in the milky way?
Sun
The ___________ studied the moons of Jupiter.
Astronomer
The Earth's ________ around the sun is not always circle.
orbit
Scientists sent a ______________ to Mars.
Space Probe
The _______ of Venus is similar to the diameter of the Earth.
diameter
What has billions of galaxies?
The universe