This is the shape of our galaxy.
Pierre Simon de Laplace
This is the man who proposed the Nebular Theory.
Galaxy motion and distance are determined by this.
This method of calculating star distance does take into consideration the brightness of a star but ignores the difference that distance can make.
This man and other astronomers proved there are many galaxies with different shapes and characteristics.
These are the chief components of the universe and are composed of dust, gases, and stars grouped together due to gravity.
the Milky Way
Our galaxy, called this, is shaped like a convex lens. It is thin at the edges and thicker at the middle. It is the home for our earth.
This is a mass of gases, dust particles, and stars that are located in space. They may exist within our galaxy or outside of it.
the Nebular Theory
This theory proposes that bodies in space, including stars and solar systems, developed from the cooling, condensing, and contracting of nebular gases.
the Local Group
The Milky Way and sixteen other galaxies make up a cluster of galaxies called this.
This is the closest star to the earth, less than 4.5 light years away. It is a triple star system.
These are the brightest of all the objects in the sky. Some astronomers believe that these are the beginning stage in the formation of a new galaxy.
This is determined by a star's brightness, size, temperature, and distance from the earth.
Scientists measure star brightness on a scale from 1 to 6 called this.
This measurement of star brightness ignores the variable of distance which affects the brightness of a star.
These are the smallest stars and are composed primarily of atomic neutrons.
Neutron stars can send out bursts of energy in the form of radio waves. This special type of neutron star is called this.
This star is an example of a super giant star.
The center of a comet is called this.
This part of a comet is formed due to melting of the comet by the sun's energy.
This is one of the stars located in our Little Dipper constellation.
This is the hazy cloud which surrounds the center of a comet.
A star has this size classification if it's diameter is 10 to 100 times larger than that of our sun.
A star has this size classification it it's diameter is over 1000 times that of our sun .
These look like hazy stars as they travel through the solar system on a definite path or orbit. As they pass close to the sun, they develop long tails that may stretch for millions of miles through space.