What role did gravity play in the formation of the sun?

The pie graph to the right shows the elements that make up the Sun, by percentages of mass. Which element makes up most of the Sun’s mass?

The phases of the moon are the regular changes in how the moon looks from Earth. In which phase is the moon not visible from Earth?

Many historical models of the Solar System were geocentric. Which of these phrases describes a geocentric solar system?

The terrestrial planets include Mars, Venus, Earth, and which other planet?

The length of a year is different for each planet in the solar system. How many days are in an Earth year?

Which of these terms describes a force of attraction between two objects that results from their masses?

Because of both gravity and centripetal force, planets move in a particular manner around the sun. Which term describes the shape of the orbit of a planet?

The moon revolves around Earth. The moon travels at a speed of about 1 km/s. Which of the following keeps the moon in orbit around Earth?

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

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