The two factors that combine to keep the planets in orbit are

The two factors that combine to keep the planets in orbit are

1. gravity and orbital speed.

2. orbital speed and mass.

3. mass and inertia.

4. gravity and inertia.

The two factors that combine to keep the planets in orbit are

1.gravity and orbital speed.2.orbital speed and mass.

3.mass and inertia.4.gravity and inertia.

What do all of the inner planets have in common?

1. They have the same period of revolution.

2. They have the same period of rotation.

3. They have the same diameter.

4. They are small and have rocky surfaces.

What do all of the inner planets have in common?

1. They have the same period of revolution.

2. They have the same period of rotation.

3. They have the same diameter.

4. They are small and have rocky surfaces.

Venus and Earth are much alike in terms of

1. their size and density.

2. their rates of rotation.

3. their atmospheres.

4. their direction of rotation.

Venus and Earth are much alike in terms of

1. their size and density.

2. their rates of rotation.

3. their atmospheres.

4. their direction of rotation.

What do the Gas Giants have in common?

1. They have are made of ice

2. They are about the size of Mars

3. They do not have solid surfaces

4. They have very few moons

What do the Gas Giants have in common?

1. They have are made of ice

2. They are about the size of Mars

3. They do not have solid surfaces

4. They have very few moons

The great red Spot is a huge storm on

1. Jupiter

2. Saturn

3. Neptune

4. Mars

The great red Spot is a huge storm on

1. Jupiter

2. Saturn

3. Neptune

4. Mars

There is enough fuel in the sun to last for about another

1. 1 billion years.

2. 5 billion years.

3. 10 billion years.

4. 15 billion years.

There is enough fuel in the sun to last for about another

1.1 billion years.2.5 billion years.3.10 billion years.4.15 billion years.

Uranus is different from most other planets because it

1. is the farthest from the sun.

2. is mostly nitrogen and helium.

3. rotates on its side.

4. has the most moons.

Uranus is different from most other planets because it

1. is the farthest from the sun.

2. is mostly nitrogen and helium.

3. rotates on its side.

4. has the most moons.

Some astronomers think Pluto should not be called a planet

because it

1. is too far away.

2. has no moons.

3. is so small.

4. is almost entirely made of gases.

Some astronomers think Pluto should not be called a planet

because it

1. is too far away.

2. has no moons.

3. is so small.

4. is almost entirely made of gases.

Identify the letter and the name:

These reddish loops link sunspot regions ____________________ Nuclear fusion occurs at ___________________________________The layer you are viewing when you look at the sun?_____________ The layer seen during a total solar eclipse at totality?_____________The coolest area of the sun? ________________________________This is the colored part of the sun’s atmosphere ________________

These reddish loops link sunspot regions _E prominences_________ Nuclear fusion occurs at ___ F__the core ______________________The layer you are viewing when you look at the sun? C_photosphere _ The layer seen during a total solar eclipse at totality?_____A__coronaThe coolest area of the sun? ___ D sunspots ____________________This is the colored part of the sun’s atmosphere _B chromosphere__

Which of these planet’s orbits is closest to Earth’s orbit?_____________________________________

Which planet has a “day” that is most similar in length to a day on Earth?__________________________ As distance from

the sun increases, period of revolution__________________Which planet has the shortest day? ___________________

Which of these planet’s orbits is closest to Earth’s orbit?__________Mars___________________________

Which planet has a “day” that is most similar in length to a day on Earth?_________Mars________________ As distance from the sun increases, period of revolution____increases______________ Which planet has the shortest day? _Jupiter__________________

Which of the following is NOT a terrestrial planet?

1.Mars

2.Venus

3.Saturn

4.Mercury

Which of the following is NOT a terrestrial planet?

1.Mars

2.Venus

3.Saturn

4.Mercury