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29 terms

Our Sun

STUDY
PLAY
a star
What is the Sun?
Nuclear fusion
How do stars get their energy?
93 million miles
How far is the Sun from Earth?
January 1st (Perihelion)
When is the Earth closest to the Sun?
July 1st (Aphelion)
When is the Earth farthest from the Sun?
Fusion
Combines atoms of lighter elements into heavier elements.
Plasma
the 4th state of matter and is the result of great heat and pressure.
E=mc2
E = energy m = mass c = speed of light What is Einstein's equation for energy?
Photosphere
the visible surface of the Sun
Chromosphere
the inner layer of the Sun's atmosphere. It extends thousands of Km.
Corona
Sun's thin outer atmosphere
Sun Spots
Dark spots on the photosphere.
Solar Wind
a constant stream of electrically charged particles from the corona.
Auroras
caused as the solar wind passes through the Earth's magnetic field at the poles.
Coronal holes
a hole in the corona giving off huge amounts of solar wind
Solar Flares
outbursts of light from sun spots giving off large amounts of solar wind.
Magnetic Storms
caused by particles coronal holes and solar flares are added to the solar wind. These storms may interrupt cell phones, radios, TV's, etc
Ptolemy
Who developed the Geocentric Model?
Geocentric
Model predicted where planets would appear in the sky
Geocentric
means "Earth Centered"
Nicholas Copernicus
developed the Heliocentric Model
Heliocentric Model
This theory explained that the Earth was just a planet like the others orbiting around the sun
Heliocentric
means "Sun Centered"
Tycho Brahe
devised his own instruments to study the Moon and Planets
Johannes Kepler
developed 3 Laws of Planetary Motion
Isaac Newton
developed the Law of Universal Gravitation
Isaac Newton
invented Calculus and modern Physics
Galileo Galilei
invented the telescope
Galileo Galilei
discovered sunspots and craters on the Moon