13-1 Flashcards
1
Q
What is AU used for measuring?
A
objects in our solar system
2
Q
what is the distance of AU?
A
the average distance between the sun and the earth (93 million miles)
3
Q
What are the inner planets?
A
the first four planets relatively close to the sun
mercury, Venus, Earth, Mars
4
Q
What is an ellipse?
A
the shape of an orbit (a flattened circle or oval)
5
Q
what was the solar system formed by?
A
a huge cloud of gas and specks of dust
6
Q
define asteroids?
A
clumps made of rock that are close to the sun
7
Q
what are comets?
A
objects of ice far from the sun
