Sec 8.1-8.2 SNC1W1
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22 Terms
What is astronomy?
The scientific study of celestial objects.
What are stars?
Massive collections of hot gases that
radiate large amounts of energy.
they are luminous
Luminous
Produce and emit their own light
What defines a planet?
A large celestial object that travels around a star.
the eight planets that travel around the Sun
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
What are terrestrial planets?
The four planets closest to the Sun with hard, rocky surfaces.
Jupiter, Saturn, Uranus, Neptune
What are Jovian planets?
The four larger planets composed mainly of gases and liquids.
Known as gas and ice gaints
Jupiter, Saturn, Uranus, Neptune
Earths order from the sun
The third planet from the sun
Earths order in size in the solar system
The fourth largest
What are galaxies?
Huge collections of stars, gas, dust, and planets within the universe
How many galaxies are in the universe?
billions
How many stars in the milky way Galaxy?
more than 200 billion stars
What galaxy is the Solar System part of?
The Milky Way galaxy.
What is the core of the Sun?
The center of the sun where high temperatures and pressures cause nuclear fusion.
What is nuclear fusion?
The process where particles collide at high speeds causing them to fuse. This releases enormous amounts of energy.
What are the three prominent features of the Sun's surface?
Sunspots, solar flares, and solar prominences.
Solar wind
created by solar winds
a stream of charged particles flowing out from the sun
Solar storm
Caused by gases of the sun swirling around
what causes the aurora borealis?
solar winds travel toward earth, when they come into contact with Earth’s magnetic field, they produce colourful displays of light
What are the other names for the aurora borealis ?
Aurora borealis & northern lights- northern hemisphere
Aurora australis & southern lights- southern hemisphere
harms of solar radiation
Solar radiation causes communication disruptions and can be hazardous to
human health.
Note 
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