major bodies orbiting the sun
The plane of Earth's orbit around the sun. All major objects of the solar system orbit roughly within this same plane.
The four planets orbiting within 2 AU of the sun including Mercury, Venus, Earth, and Mars.
The four planets orbiting beyond 2 AU of the sun including Jupiter, Saturn, Uranus, and Neptune.
A small rock in interplanetary space, which can include a fragment of an asteroid or comet.
A body composed of ice and dust that orbits the sun
The average distance between Earth and the Sun, which is about 1.5x10^8km (about 9.3 x 10^7mi)
The idea that the sun and planets formed together from a cloud of gas and dust, a nebula
planets because of their large size and gaseous compositions resemble Jupiter
Disk shaped region of the sky beyond Jupiter
A cloud of gas and dust visible in outer space
Center of a nebula
The luminous envelope of a star from which its light and heat radiate.
A relatively large icy body, such as PLuto, orginating within the Kuipler belt
A reddish gaseous layer immediately above the photosphere of the sun or another star.
The rarefied gaseous envelope of the sun and other stars. Only visible during a solar eclipse
Giant Impact Theory
proposes that the Moon was created out of the debris left over from a collision between the young Earth and a Mars-sized body
A region between the orbits of Mars and Jupiter containing small, rocky, plantlike fragments that orbit the sun.
The region beyond the Kuipler belt populated by trillions of icy bodies and a source of long-period comets.
An imaginary sphere surrounding Earth to which the stars are attached
Change positions with respect to the stars
Rotation of the celestial sphere from east to west
No nuclear fire in a white dwarf means it is not a star anymore it is a...
A plot of intrinsic brightness versus surface temperature for stars.
An expanding shell of gas ejected from a low-mass star during the latter stages of its evolution
The diagonal band of stars on an H-R diagram; such stars generate energy by fusing hydrogen to helium
A small, extremely dense star composed of tightly packed neutrons formed by the welding of protons and electrons
spherical region of space where gravity is strong enough that photons are forced to travel in orbits.
A dying star that has collapsed to the size of Earth and is slowly cooling off; located at the lower left on the H-R diagram
the fusion of helium and carbon
Rapidly spinning disk
The boundary region of a black hole from which no radiation may escape. Any events within the event horizon are invisible to distant observers.
The total amount of light energy that a star emits into space.
Cool giant stars above main-sequence stars on the H-R diagram.
The distance light travels in 1 year.
Discovered that the universe expands
Brimming with energy
stars that change their brightness overtime
Active Galactic Nucleus
A supermassive black hole at the center of a galaxy into which matter is falling at a high rate, thereby releasing astronomical amounts of energy.
a galaxy shaped like a round or flattened ball, generally containing only old stars
a galaxy having a spiral structure
a galaxy that does not have a regular shape
Explosion of space and beginning of time
Outer ring of black hole which attracts material from a star or other objects
Immediate cluster of galaxies
A cluster of galaxy clusters.
change in the apparent frequency of a wave as observer and source move toward or away from each other
very bright centers of distant galaxies.
empty spaces between filaments and contain few or no galaxies.
Collection of star systems held together by gravity