Which is the final event that occurs when a star is forming?
Which remains the same as the distance of an object from Earth changes?
Observable matter makes up about what percentage of the universe?
What was discovered in 1965 and is believed to be leftover thermal energy from the big bang?
Which is a future NASA research project?
What term describes the moon’s path around Earth?
Which characteristic do Mercury and Mars share?
What term specifically describes small chunks of rocks and debris in space that burn up in Earth’s atmosphere?
Which term defines a star system with two stars?
In which range is the peak wavelength of a star that is much hotter than the Sun most likely to be?
Which causes objects in the universe to resist a change in speed or direction?
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Which is one physical property that all stars have?
What force acts between Earth and the moon?
What is the correct order of star colors from hottest to coolest?
Which is a factor that keeps Earth in orbit around the Sun?
Which statement correctly describes terrestrial planets?
What occurs as energy is transferred through the radiative zone of the Sun? Check all that apply.
Scientists believe that some mass extinction events are possibly caused by asteroids, volcanic activity, or climate change. How many mass extinctions have occurred on Earth in the last 4.6 billion years?
Which planet is small, with a rocky surface and an atmosphere?
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