The cores in the terrestrial planets are thought to be made out of gas.

How did astronomers determine the age of our solar system?

Venus has a high surface temperature because

Which of the following is a reason that Earths surface has very small number craters as compared to our Moons craters?

In the greenhouse effect,

With electromagnetic waves, shorter wavelengths mean lower energies.

Epicycles are used in a geocentric model to explain the

 When Jupiter is at opposition (see diagram), it is overhead at  

The theory that the moon was formed independently elsewhere and was later captured by the earth is considered the most likely theory to be true.

Earths albedo changes daily and seasonally due to Earths rotation and revolution that induce variation of parts of the Earths surface under the Sun.