Reading...
Play button
Play button
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;
9 Cards in this Set
- Front
- Back
|
Spectroscope |
a tool that spreads light into different wavelengths |
|
|
Astronomical unit |
the average distance between Earth and the Sun, about 150 km |
|
|
Light-year |
the distance that light travels in one year, 300,000 km/s |
|
|
Apparent magnitude |
a measure of how bright an object appears from earth |
|
|
Luminosity |
the true brightness of an object
|
|
|
Galaxy
|
a huge collection of stars
|
|
|
Dark Matter
|
matter that emits no light at any wavelength
|
|
|
Big Bang Theory
|
the universe began from one point billions of years ago and has beenexpanding ever since
|
|
|
Doppler Shift
|
the shift to a different wavelength
|
