What is the best current method for determining the luminosity of a nearby star?

If you give a cart with a mass of 3.0 kg a push with a force of 69 Newtons, what is the cart’s acceleration?

Match the planets to their pictures.  

What is the best current method for determining the masses of stars?

The globular clusters in our galaxy form a ‘swarm’ that is centered on

What is the most abundant component of Earth’s atmosphere?

How would your mass change if you traveled to the Moon?

Choose the statement that best describes how a moon can be destroyed within the Roche limit.

Saturn’s moon Titan

Which planet is the most heavily cratered?