The Sun
It takes 50 million years for energy produced in this part of the Sun to reach the Sun's photosphere:
When a star begins as a cloud of luminous gas it is called a ___________.
protostar
The ________ protects us from the Sun's harmful electromagnetic radiation.
atmosphere
When a star uses up its hydrogen fuel and starts burning helium it swells up into a _________.
red giant
This constellation points to Polaris, the North Star:
The Big Dipper
How long does it take for the light from the Sun to reach the Earth?
8 1/2 minutes
What is the force that causes particles in a protostar to fall inward toward the center?
gravity
The distance measured crest to crest or trough to trough is called __________.
wavelength
When a star uses up all of its fuel, gravity causes it to ________.
collapse
_________ is the brightness of a star.
Magnitude
The spectrum of energy radiated by the Sun is called ________.
Electromagnetic spectrum
The name of the process that takes place when the nuclei of hydrogen atoms fuse to make helium is ________.
nuclear fusion
The _________ wavelength of electromagnetic energy is what causes sunburn.
ultraviolet
The explosion that happens when a giant blue star reaches the end of it's life is called a ___________.
supernova
On a star map, ______ and ________ are reversed.
East and West
Of all the energy radiated by the Sun, ______ of it reaches Earth.
one billionth
_______ are clouds of dust and gas in space sometimes called "star nurseries"
Nebula
Electromagnetic energy with the shortest wavelength is _____________.
Gamma rays
The incredibly dense, celestial body that is left after a supernova is called a _______________.
neutron star
According to Newton's Law of Gravitation, the force of gravity depends on ________, _________, and ________.
mass, size, and distance
The sun is _________ years old.
4.6 billion
If a star is one billion light years from Earth, it takes _________ years for that light to reach Earth.
one billion years
Electromagnet energy travels at ____________.
the speed of light/186,000 miles per second
When a neutron star continues to collapse into a point, it becomes a ____________.
black hole
The moon's gravity pulling on Earth causes _________.
ocean tides