Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
10 Cards in this Set
- Front
- Back
Milky Way
|
The galaxy containing the solar system, visible as a broad band of faint light in the night sky.
|
|
Galaxy
|
A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
|
|
Cosmology
|
The study of the physical universe considered as a totality of phenomena in time and space.
|
|
Redshift
|
An increase in the wavelength of radiation emitted by a celestial body as a consequence of the Doppler effect.
|
|
Hubble's Law
|
Astronomy a law stating that the velocity of recession of a galaxy is proportional to its distance from the observer
|
|
Big Bang Theory
|
A cosmological theory holding that the universe originated approximately 20 billion years ago from the violent explosion of a very small agglomeration of matter of extremely high density and temperature.
|
|
Cosmic Microwave Background
|
the cooled remnant of the hot big bang that fills the entire universe and can be observed today with an average temperature of about 2.725 kelvin
|
|
Radiation
|
The emission of energy as electromagnetic waves or as moving subatomic particles.
|
|
Dark Mattter
|
a type of matter hypothesized to account for a large part of the total mass in the universe.
|
|
Dark Energy
|
A form of energy hypothesized to reside in the structure of space itself, responsible for the accelerating expansion of the universe
|