Stars
What summarizes the three conditions necessary for a star to form?
Presence of a molecular gas that is cold and dense.
What is the reason for the seasons on earth?
Earth's axis is tilted at 23.5 degrees which makes our days in the northern hemisphere longer when the north pole is tilted toward the sun.
What is the most likely origin of the Earth's moon?
Giant impact between young Earth and a Mars sized planet.
Why does the sun rise and set everyday?
Because, as viewed above earth's north pole, the earth spins on it's axis clockwise.
If a star moved twice as far away from us how would it appear?
Which planet in our solar system has seasons most similar to Earth?
Mars
What is the most likely origin of Mars' two moons?
They are captured Asteroids.
How long is the expected lifetime of the sun?
10 billion years.
How can you measure the temperature of a star?
From it's thermal spectrum and it's spectral type.
Which planet in our solar system experiences the most extreme seasons?
Uranus
Why is earth's moon way more cratered than Earth?
The moon has no atmosphere, there is no erosion on the moon and the moon does not have plate tectonics.
Which layer is farthest from the core of the sun?
Corona