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Chapter 16 Stars & Galaxies

5th grade science chapter 16 stars and galaxies
STUDY
PLAY
Galaxy
a large group of stars in the universe
Spiral Galaxy
galaxy that is pinwheel shaped with a thin disk with long arms; gas and dust rotate around the central hub of the galaxy
Elliptical Galaxy
huge galaxy that is round or oval in shape
Irregular Galaxy
huge galaxy with no regular shape
Star
huge, hot body made of different gases; radiates energy (light)
Nebula
an immense cloud of gas (mainly hydrogen) and dust in space; where stars form
Huge Stars
Use up their fuel faster than sun-sized stars; go on to become a super red giant, then explode in a supernova then collapse into a neutron star
Giant Stars
Use up their fuel even faster than huge stars; go on to become a super red giant, then explode in a supernova then collapse into a black hole
White Dwarf
what a sun-sized star becomes after its red giant stage
Black Dwarf
what a white dwarf becomes after it has given off all its heat
Supernova
when the core of a super giant star collapses causing an explosion
Neutron Star
dense core of neutrons left after a supernova explosionstar
Black Hole
dense region where gravity is so great that not even light can escape
Absolute Magnitude
the amount of light a star ACTUALLY gives off
Apparent Magnitude
the amount of a star's light we see from Earth
black hole
a point in space where gravity is so strong that nothing can escape it
constellation
an area of the sky and all the stars seen in that area
galaxy
a huge system of planets, stars, dust, and gas held together by gravity http://farm3.staticflickr.com/2648/3927825968_de6316b2f4.jpg
light-year
the distance light travels in one year, about nine trillion kilometers
nebula
a cloud of gas and dust in which stars may form http://farm5.staticflickr.com/4147/5014452663_484e24d999.jpg
supernova
a huge explosion that occurs when a very large star collapses
eclipse
the partial or total blocking of one object in space by another http://farm6.staticflickr.com/5284/5279935720_41a61f0d3d.jpg
star
any celestial body visible (as a point of light) from the Earth at night
solar flare
a sudden eruption of intense high-energy radiation from the sun's surface http://farm5.staticflickr.com/4153/4974263471_4dbfd9f78b.jpg
milky way
the name of our galaxy, a spiral galaxy that contains about 400 billion stars

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