What size is Mercury compared to the other planets?
It is the smallest.

What are the temperates like on Mercury?
Very very hot or freezing cold. 

Where is Venus located?
It is the 2nd (second) planet from the sun. Between Mercury and Earth.
Why is Venus called "A Sister Planet" to Earth?
They are about the same size and made of the same materials, rocks. 
Where is Earth located?
3rd planet from the sun. Between Venus and Mars.

Where is Mercury located?
Next to the sun. It is the 1st planet. It is between the Sun and Venus.

Does Mercury have an atmosphere? Or air around it that protects it like Earth does?
NO!!! Mercury has a lot of craters because there is not atmosphere to stop things from hitting the planet.
What is Venus' temperature like?
It is the hottest planet.

How is Venus different than other planets in the way it moves?
It rotates in the opposite direction. This means the Sun rises in the west and sets in the east.
What is Earth's shape?
It is like a squished balloon. It bulges in the middle, oblate spheroid or oblate ellipsoid 
What does Mercury look like?
It looks like Earth's Moon. It has a lot of craters.

Is Mercury moving fast or slow?
Fast, It is the fastest planet.
What does the surface of Venus look like?
It is rocky and has a lot of volcanoes.

Why is Venus so bright in the night sky?
It reflects 70% of the sunlight back into space. 
Why is Earth called a Goldilocks Planet?
Because everything needed to live and survive on the planet it "Just Right" 
Is Mercury getting bigger or smaller?
It is shrinking. The iron core is cooling down and getting smaller. 

88 Days
How many moons does Venus have?
ZERO
What are the only two objects in space that are brighter than Venus?
The sun and the moon are brighter than Venus. 
How many moons does the Earth have?
Just 1. The only planet with just one moon.

How many moons does Mercury have?
Is Mercury made of gases or rocks?
It is a terrestrial planet, meaning it is made of rocks. 

What color is Venus?
Yellow-white, or orange-ism.

Why can't humans live on Venus?
It is too hot and has poisonous gases.
What do you call the air that is around the Earth?
The atmosphere. 