One complete revolution of the Earth around the sun takes about

Earth has seasons because

In the Southern Hemisphere, the summer solstice occurs when the sun is

All objects are attracted to each other by the force of

The strength of the force of gravity depends on

What layer are you looking at when you look at an image of the sun?

The solar wind is a stream of electrically charged particles that extend outward from the sun's

What do the four outer planets have in common?

What do all of the inner planets have in common?

A light-year is

A pattern or grouping of stars imagined by people to represent a figure is a

The sun produces energy by

Characteristics used to classify stars

The Hertzsprung-Russell diagram shows that main-sequence stars

A star is born when

Which of the following is a major difference between elliptical galaxies and spiral galaxies?

Eclipsing binary stars can sometimes be identified because

From the cosmic background radiation, scientists can infer that, just after the big bang, the universe must have been

According to Hubble's law, the farther away a galaxy is,

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