Chapter 16 Stars & Galaxies

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5th grade science chapter 16 stars and galaxies

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

Flickr Creative Commons Images

Some images used in this set are licensed under the Creative Commons through Flickr.com. Click to see the original works with their full license.

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