When we say an object is in orbit, we mean that it is traveling around another object in space. What do planets in a solar system orbit?

Our solar system consists of eight planets. Each planet is classified as either a terrestrial planet or a gas giant planet. Which is a difference between these two types of planets?

A galaxy contains stars, gas, and dust. This matter must be held together or the galaxy will break apart. What is responsible for holding the stars, gas, and dust together in a galaxy?

Galaxies are large groups of millions, billions, or even trillions of stars. What keeps the stars in a galaxy from moving away from each other?

The sun is much larger than the moon. However, as viewed from Earth, the sun and moon appear to be the same size. Why do the sun and moon appear to be the same size when viewed from Earth?

One way to compare the objects of space is by their relative sizes. Which of the following is larger than a galaxy?

Which of the following correctly lists the objects of space in order from largest to smallest?

One of the objects that astronomers study with telescopes on land and in orbit around Earth are called nebulae. Which statement correctly describes what a nebula is and where in relation to other objects nebulae may be found?

A galaxy holds a special place among all the other objects in outer space. Which is the best description of a galaxy according to its relationship to other objects?

Weight and mass are related, but they are not the same thing. If you weigh 115 kilograms on Earth, you would weigh 19 kilograms on the Moon and almost 272 kilograms on Jupiter. Which statement explains why your weight would be different on these bodi

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