The flashcards below were created by user
Aamir101
on FreezingBlue Flashcards.
-
Milky way
The galaxy that includes the solar system; appears as a hazy white band in the night sky
-
Galaxy
A collection of stars, dust, gas and planets all held together by gravity
-
Star cluster
A collection of stars held together by gravity
-
Open clusters
A collection of 50 to 1000 stars; open clusters appear along the main band on the Milky Way
-
Globular clusters
A collection of 100,000 to 1,000,000 stars that is arranged in a spherical shape and are found in the centre of the Milky Way
-
Local group
A small group of Galaxies (40) that include the Milky way
-
Supercluster
A gigantic cluster of 4 to 25 cluster galaxies that is hundreds of millions of light-years away
-
Shapes of galaxies
Spiral- A galaxy that looks like a spiral with extended arms comming out of it; we are locates in a spiral galaxy
Oliptical- A galaxy that looks circular or ellipse that contains some of the oldest stars in the galaxy
Irregular- A galaxy that dose not have a distictive shape but contains new and old stars
-
Cosmology
The study of the universe
-
Doopler effect
The change in frequency of a light source due to its motion relative to an observer; also, the change in pitch of a sound due to the motion of the source relative to an observer
-
Redshift
The effect in which objects moving away from an observer have their wavelenghts lenghthened
-
Blueshift
The effect in which objects moving toward the observer have their wavelenghts shortened
-
Big bang
The event that may have triggered the expansion of the universe 14 billion years ago
-
Cosmic microwave radiation
The radiation left over from the Big bang whcih fills the universe
-
Dark matter
The most abundant form of matter in the universe; inviasble to telescopes
-
Dark energy
A form of energy that makes up nearly 3 quarters of the universe; has the effect of increasing the expansion of the universe
|
|