Ch6 Astronomy Flashcards
1
Q
How do the planets orbit?
A
Elliptical
2
Q
What is the gravitational field strength
A
Strength of gravity on a planet or moon.
On Earth it is approximately 10 N/kg
3
Q
Are planets nonluminous are aluminous
A
Non-Luminous.
We can see them because they reflect light from the sun
4
Q
How many days does it take the moon to orbit the earth
A
- 5 days
- One lunar month
5
Q
What Are comets made of
A
Dust and ice
6
Q
What is newtons law of gravity
A
Newton suggested that between any two objects there is a force of attraction, due to the masses of the objects, called gravitational force.
The size of the force depends on:
-The masses of the two objects
-The distance between the masses
7
Q
How many planets are there
A
Eight
