Which two characteristics do all Jovian planets have

in common?

Which event occurred approximately 4.6 billion years ago?

Energy is produced within a star's core by the process of

Planets that are closest to the Sun are identified as

large hard rocky objects orbiting between Mars and Jupiter are called ______.

Objects made of ice and rocks that orbit the sun with very elliptical orbits, disappearing beyond the planets for many years at a time, and then reappear passing by the sun are called ________

Earth is a _____ planet.

Jupiter is a ________ planet.

What force causes a Nebula to stop expanding, and then to start collapsing inward?

As a nebula collapses inward because of gravity, what percentage of the matter ends up forming a new star?

The material of the nebula that is not incorporated into the new star forms

As the nebula collapses, the center ______ because of conversion of kinetic energy to thermal energy

As the Nebula collapses, it starts_______faster and faster

Rapid rotation of the collapsing nebula causes the remaining material to form a ______ shape, instead of the 3 dimensional sphere it was originally.

The remaining 1 % of material in the Nebula's spinning disk starts combining together because of gravity, forming

As Planetismals orbit the new star, as they come near each other combine getting larger and larger, forming _________.

Protoplanets orbiting the new star combine with other ______ growing larger and larger.

Over time, the _________ attract the majority of matter from the solar system, leaving mostly empty space.

When the protoplanets have cleaned out the space between them, and have stable orbits, they become true _____.

Planets close to the sun have lots of metals and silicates. They first form as balls of lave, and then become hard and rocky. They are called

Planets farther out into space are formed mostly of gases like hydrogen and helium. They have no hard rocky surface. They are called _____.

A comet forms a meteor shower when

The gas giants in our solar system are:

Astronomers believe that Jupiter’s strong magnetic field is caused by

The large reservoir of comet nuclei far beyond Pluto, from which we believe new long-period comets come into the inner solar system, is called:

A key difference between the protoplanets that formed in the outer solar system and those that formed in the inner solar system was that

Which planet in the solar system rotates the most slowly (has the longest "day")?

The rules to be a planet are

The asteroid belt formed when

Which of the following is NOT a way that Jovian planets can be distinguished from terrestrial planets?

Which of the following worlds does NOT have a ring (as far as we know)?

Which of the following planets does NOT have an atmosphere?

Which of the following statements about the tails of comets is FALSE?

The satellite which has the thickest atmosphere (so thick that it’s quite a surprise for a satellite) is:

Which of the following characteristics distinguishes Uranus from every other planet in our solar system?

The largest planet in our solar system is:

What gas causes Uranus and Neptune to look blue?

Which is true about Mercury, Venus, Earth, and Mars

What is the hottest planet?

What is found in the Kuiper Belt?

Pluto is in a group of objects called

How does the atmosphere affect the temperature of a planet?

A planetesimal is a

Which object helps astronomers to know how old our Solar System is?

Which of the following are evidence that Mars once had abundant liquid water? (choose all that apply)

Helium is common in these planets atmospheres.

A meteoroid that passes through the atmosphere and hits the Earth's surface

Which compound would be the least common in a reduced by hydrogen atmosphere?

Which of the following is the name for the minimum distance a moon must be away from its primary body (thing it is orbiting) in order for it to remain a moon and not get torn apart by tidal forces?