Celestial bodies can be calssified based on their sizes. Which of the following is the smallest?

One way to compare the objects in space is by their relative sizes. Which of the following correctly lists the objects in space in order from largest to smallest.

If a star is 300 light-years from Earth, how long does it take light from the star to reach Earth?

A scientist finds a star that is located far from Earth. Upon closer examination, she discovers that the star appears to have several smaller bodies orbiting it. Which of these terms would the scientist use to describe her findings?

What is the term for sum of all space, matter, and energy that exist, that have existed in the past, and that will exist in the future?

Which of the following terms is used to describe several planets orbiting a star?

Astronomers use the light-year to describe the relationship between objects in space. For example, the Andromeda galaxy is 2.5 million light-years from Earth. Which of the following units is most similar to the light-year

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?

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?

An astronomer uses a telescope to observe a star. She observes that the color of this star is similar to the color of the sun. Therefore, she infers that the star and sun have similar sizes and surface temperatures. Using this information, what can the astronomer conclude about the star?

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

If a star is 3 light-years from Earth, how long does it take light from that star to reach Earth?

Which of the following is part of the universe?

While planets are smaller than stars, planets are generally larger than which of the following?

How do galaxies range in size?

Earth's sun and the objects that orbit it are part of a larger group of gas, dust, stars, and other space objects called the Milky Way. What is the Milky Way?

A star system called HD 188753 contains Stars B and C, which are binary stars that orbit around each other and in turn orbit around star A. What kind of system is this?

Which of the following statements best describes a binary star system?

OF the following four stars, which should Ashni label as the hottest?

What type of star is the sun?

Which of the following statements does not accurately describe the Hertzsprung-Russell diagram?

Which process causes a star to give off light

Which stage in the life cycle of a high-mass star is characterized by the star collapsing and throwing its outer layers into space?

What kind of star becomes a giant when fusion slows down, the outer atmosphere of the star expands, luminosity increases, and the star begins to fuse helium into carbon?

Stars have different life cycles depending on the mass of the star. Which of the following is in correct order, beginning with nuclear fusion and ending with the end-of-life cycle state?

Which of the following ends its life cycle in the form of a neutron star or a black hole?

When does a low-mass star become a giant?