the distance that light travels in 1 year; used to measure distances between stars and galaxies
What is a light year
100
a large group of stars, gas and dust held together by gravity
What is a galaxy
100
technology sent into space to collect information about planets and other ojects in space
What is a probe
100
A large cloud of gas and dust found in space; varitey of shapes
What is a nebula
200
the set of 4 planets closest to the sun
What is the inner planets
200
patterns of stars in the night sky
What is constellation
200
the name of the galaxy we live in
What is the Milky Way
200
Cloud of comets that is located beyond the orbit of Pluto; almost spherical cloud around the outer boundaries of the Milky Way
What is Oort Cloud
200
hydrogen in the core of a star is depleted, the core contracts increasing the temperatures causing the outer layers to expand and cool
What is a giant star
300
The set of 4 planets and 1 dwarf planet furthest from the sun
What is outer planets
300
area on the sun that appears dark because it is cooler than the surrounding areas
What is sunspot
300
spiral arms that wind outward from the center with the arms consisting of bright stars, dust, and gas; our galaxy is this type
What is a spiral galaxy
300
a pieces of rock similar to the material that formed planets located between Mars and Jupiter
What is asteroid belt
300
final stage in the evolution of a very massive star where the core's mass collapses to a point that its gravity is so strong that not even light can escape
What is a black hole
400
The "sister" or "twin" planet to the Earth
What is Venus
400
indicates the temperature of a star
What is the color
400
galaxies shaped like large 3-dimensional ellipses; can be round or oval, large or small
What are elliptical galaxies
400
pieces of rock and dust that burn up in the Earth's atmosphere
What is a meteor
400
collapsed core of a supernova that can shrink to about 20 Km indiameter and contains only neutrons; extremely heavy for the size due to the density of the particles
What is a neutron star
500
the Third planet from the star in the Milky Way
What is Earth
500
the reaction that occurs in the core of a star that produces heat and light
What is nuclear fusion
500
billions
What is the number of galaxies
500
dust and rock particles mixed with frozen water, methane, ammonia; having a nucleus, coma, dust tail, and ion tail
What is a comet
500
in about 5 milion years, the hydrogen will burn out and it will no longer produce heat or light