These occur when Earth's orbit passes through a group of meteoroids that enter the atmosphere.

Name given to small pieces of an old comet as they move through space.

A meteoroid that strikes the surface of a moon or planet

A piece of rock made up of material similar to which formed the planets.

Space object formed from dust and rock particles mixed with frozen water, methane, and ammonia.

System of 8 planets including Earth and other objects that revolve around the sun.

A large collection of comets that completely surround the solar system by the orbit of Pluto.

This person proposed the Sun-centered model of the solar system.

This person discovered that planet orbits were elliptical and that the Sun was not directly in the center of the orbits.

This person helped prove the Sun-centered model of the solar system and discovered 4 of Jupiter's moons.

Which planet has the lowest density and hundreds of thin rings.

Which planet is very hot and has sulfuric acid in its clouds.

Which planet's axis of rotation is on its side, nearly parallel to its plane of orbit.

Two planets with similar size and mass are

Which planet averages 150 million km, or 1 AU, from the Sun?

Which planet is the smallest and closest to the sun?

This planet appears reddish-yellow due to iron oxide in its rocks?

This planet has a storm system called the Great Dark Spot?

The Great Red Spot is a continuous storm on which planet?

Methane gives what planets their blue-green color?

The solid portion of a comet is called

A cloud of gases that surround the solid portion of a comet are known as the

Which of the following are considered both inner planets?

Which one of the following is now no longer classified as a planet?

Most asteroids are located in the area between the orbits of

What comet was discovered by two amateur astronomers in 1995?

Which of these are considered dwarf planets? (Select all that apply)

What did the NEAR spacecraft do?

Which planet has the largest volcano in the solar system?

What is the name of the largest moon in the solar system?

Currently which planet has the most moons?

Which planet or planets have rings?

What direction does a comet's tail point?

What is this group of planets called?

What is this group of planets called?

What compromises the structure of a comet?

Where can most of the dwarf planets be found?

The fuzzy atmosphere around a comet is called?

Chunks of dust, dirt, and ice that is still solid is what part of the comet?

There are _________ planets in our solar system.

Which rover landed on Mars back in 1997 and was the first successful probe on Mars since the Vikings back in 1976?

What is the order of the planets from smallest to largest?

Put the planets in order from the sun.

What compound is responsible for the color of the soil on Mars?