B. Rovers are what you are looking for
Hi there!
Gravity from the sun is even and makes a planet orbit the sun by exerting a force that pulls the planet towards it. Since the gravity of the sun is always the same (or very, very similar), the planet's orbit stays the same.
Hope this helps!
Answer:
A group is a vertical column of elements on the periodic table whereas a period is a horizontal row of elements on the periodic table.
