What causes a crescent moon?
Why are total solar eclipses rare events?
What is the cause of Earth's season's?
What bodies in our solar system have surface gravity?
What are the main factors that determine an object's surface gravity?
To determine the scale of an image you should take the actual size of of the object and divide by the measurement of the object in an image.
What is criterion?
Which planet has the highest surface gravity in our solar system?
What determines an objects weight?
What object(s) contains more than 99% of the mass in our Solar System?
Which planets are the outer planets?
The farther a moon is from its planet, the shorter its orbital period.
What is the correct image scale for an image that covers a real life 25 Km but the photograph is 100 mm wide?
When does a lunar eclipse occur?