Test: The planets and the Solar System - Year 7 MCQ

The particles that make up Saturn’s rings range in size from smaller than a grain of sand to as large as a mountain.

The Milky Way galaxy contains an estimated 100–400 billion stars. They are held in place by gravity, and the galaxy rotates slowly, with the Sun taking about 220 million years to complete one orbit around the center of mass.

The Sun is the center of our solar system because its immense mass creates a gravitational force that keeps planets, moons, and other objects in orbit around it. The surface temperature of the Sun is about 5,500°C.

They have to keep moving otherwise they would simply fall back down towards the surface of the Earth and burn up like a meteor as they entered the atmosphere.

The Milky Way is the name given to the galaxy of stars in which the Sun is situated. There are many other galaxies in the universe, some contain more stars than ours and some are smaller.

The moon's gravitational pull on Earth's water causes tidal bulges, resulting in high tides.

Planets are visible because they reflect light from the Sun. They are sometimes out of sight when they are between the Earth and the Sun or on the opposite side of the Sun from Earth.

Climate change leads to higher sea levels, causing high tides to reach greater heights, potentially leading to flooding in coastal areas.

Some scientists think that Pluto is a planet, however it was reclassified as a dwarf planet in 2005.

High tide refers to the highest point reached by the ocean's water level due to gravitational forces, primarily from the moon.