Astronomy Midterm Review

A small body of icy and dusty matter that revolves about the Sun; some of its material vaporizes, forming a large head of tenuous gas and often a tail.

• Asteroid

• Meteorite

• Jovian planet

• Comet

It is a cloud of gas and dust from which the solar system formed.

• Comets

• Asteroid belt

• Solar Nebula

• Meteor shower

The planets Mercury, Venus, Earth and Mars are categorized as ______.

• Terrestrial

• Planetesimals

• Giant

• Solar nebula

These are also known as Circumstellar disks.

• Solar Nebulas

• Milky way

• Planetesimals

• Asteroid belt

It is also called gas planet where Saturn, Neptune, Jupiter and Uranus belongs.

• Giant planets

• Terrestrial planets

• Jovian planets

• Planetesimal planets

The largest planet in the solar system

• Jupiter

• Neptune

• Uranus

• Saturn

Some larger chunk of rocky or metallic material survives its passage through the atmosphere and lands on Earth. Any piece that strikes the ground is known as a ______.

• Meteorite

• Meteor

• Asteroid

• Comet

It is a process by which certain kinds of atomic nuclei decay naturally, with the

spontaneous emission of subatomic particles and gamma rays.

• Planetesimals

• Half-life

• Differentiation

• Radioactivity

These are objects that formed in the solar nebula as an intermediate step between tiny grains and the larger planetary objects we see today.

• Gian planets

• Terrestrial planets

• Planetesimals

• Solar nebula

The planet that has the most number of moons.

• Earth

• Saturn

• Jupiter

• Mercury