Science Earth/ Space Review Flashcards
Define Galaxy.
A collection of stars, dust, and gas bound together by gravity
What unit would you use to measure the distance between stars?
Light years
What color are the hottest stars?
Blue
How long does it take for the moon to rotate?
28.5
Where is the energy of the Sun produced? How does the energy transfer it’s way to the surface?
The core. Radiation Zone and Convection
What holds stars in their galaxies?
Gravity
What is the Law of Conservation of Energy and how is it applied to the Earth-Sun system?
The energy that was changed in the sun was brought down to earth
How long does it take for the moon to orbit the Earth?
28.5 days
What does the Hertzsprung-Russell diagram show us?
The brightness and temperature of the different stars
Define Spring tides
When there is high and low tides. The Sun, Moon, and Earth are in a straight line.
Define Neap tides
When the tides are all equal (barley any). The Sun, Moon, and Earth are in a right angle
What force holds stars together?
Gravity
What unit would you use to measure the distances between planets?
AUs
Define apparent magnitude
The measure of a star’s brightness as seen from earth.
Define absolute magnitude
The actual brightness
