Which of the following summaries expresses the main points of the passage best?

• A. Gravity is the most important aspect of our universe. Without it, we would all be floating off into the universe. There wouldn't be any orbits; instead, all planetary bodies would simply float around, running into each other when they crossed paths and just wandering forever.

• B. There is a gravitational force between all objects in the universe. Gravitational force is what keeps all components of our solar system in orbit around the Sun, as well as moons in orbit around planets. The force of gravity affects Earth's tides and holds us on Earth's surface. The force of gravity between objects depends on their masses and the distance between them.

• C. Gravity is hard to understand and scientists have little to no understanding of how it works. We know that gravity is out there, but the specifics are often lost on us. Plants, animals, and humans are all able to grow tall due to the pull on Earth from the Sun. Without the Sun, we would all just stretch out along Earth's surface.

• D. None of the above.

The force of gravity between two objects depends on ____________.

• the amount of attraction between the two objects

• how much each object weighs

• how close the objects are to each other

• the mass of the two objects and the distance between them

Which best describes why gravity on Earth has a stronger attraction with you than the Sun has?

• A. Earth has more mass than the Sun, allowing a stronger attraction to form.

• B. The Sun has more mass than Earth.

• C. Earth has a smaller mass than the Sun, but it is much closer to you than the Sun, allowing for a stronger attraction.

• D. Earth has more magnetism than the Sun.

SUN : PLANET ::

• A. EARTH : MOON

• B. TIDES : SUN

• C. MOTH : FLAME

• D. SEASONS : MOON

Halley's comet is a comet that passes close to Earth every 75 years. Based on this passage, which gravitational attraction has the most influence on the movement of this astronomical object?

• Attraction between the comet and Jupiter

• Attraction between the comet and the Moon

• Attraction between the comet and Earth

• Attraction between the comet and the Sun