grade 9 astronomy

26 terms by ZUleika-L

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Apparent Magnitude

the brightness of a star as seen from Earth. Our Sun = -26

Asteroid

rock debris of various sizes, orbits Sun. Found in belt between Mars and Jupiter.

Aurora Australis/Borealis

a shimmering light in Earth's Polar regions, which is a result when high-energy-charged particles from solar wind are carried past Earth's magnetic field, generating electrical currents that flow toward the poles. Electric currents charge the gases in upper atmosphere.

Comet

a flying ball of dust, ice, gas and rocks. The tail is a reflection of sun's light (white) or gases ionized by radiation (blue). It will always orbit until it dissipates (dies out)

Corona

area of highly ionized gas surrounding the Sun.

Eclipse

when one celestial body is directly in front of another.

Galaxy

collection of stars, dust, gas, and planets held together by gravity.

Lunar Eclipse

sun casts a shadow of Earth that completely covers moon. No light from sun can reflect off moon, therefore moon disappears.

Meteor

meteoroid colliding with Earth's atmosphere. Burns up during atmospheric friction.

Meteorite

meteoroid that falls to Earth.

Meteoroid

rock in space.

Nebula

vast cloud of gas and dust. The beginning of a star.

Planet

object that orbits one or more stars, but is not a star itself. It does not share its orbit with another object.

Planetisimal

the result of collisions that build rock debris. Eventually will combine into a planet after enough rock debris.

Photosphere

surface of the sun.

Protostar

hot condensed object at the centre of a nebula.

Retrograde Motion

direction opposite to movement of something else. Since the orbits of the planets are of different sizes, they take different amounts of time to revolve around Sun. From Earth, their apparent motion resembles a loop.

Satellites

objects that orbits a celestial body. Moon, man-made radar satellites.

Solar Eclipse

when moon is between Earth and sun, casting shadow onto earth. Sun's light is blocked out, but it is still harmful to watch.

Solar Flares

magnetic fields explosively eject intense streams of charged particles into space.

Solar Prominence

large eruptions of luminous hydrogen gas that rise thousands of km above chromosphere.

Solar System

group of planets that orbit around a star.

Solar Wind

a stream of fast-moving charged particles ejected by Sun into solar system.

Sunspot

area of strong magnetic fields on photosphere. It has a different temperature than the Sun.

Tides

moon orbits earth, gravity pull makes high and low tide.

Universe

all stars, planets, moon, dust, gas, energy, solar system, galaxies.

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