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;
8 Cards in this Set
- Front
- Back
- 3rd side (hint)
|
Before we can use parallax to measure the distance to a nearby star, we first need to know |
The Earth-Sun distance |
1 AU |
|
|
Stellar Parallax is caused by |
Earth's orbit around the Sun |
|
|
|
A parallax of a more distance star... |
Has a smaller parallax angle |
|
|
|
Hubble's law expresses a relationship between |
The distance of a galaxy and the speed at which it is moving away from us |
|
|
|
We can determine the recession velocity of a galaxy from it's redshift. But before we can use Hubble's law, we must first calibrate it by |
Measuring the distances to many galaxies with a standard candle technique |
|
|
|
What best describes the meaning of Hubble's constant (H0)? |
It describes the expansion rate of the universe, with higher values meaning more rapid expansion |
|
|
|
Which cosmic distance measurement techniques are considered standard candle techniques? |
Cepheids, main-sequence fitting, white dwarf supernovae (distant standards) |
|
|
|
Why do we use Hubble's law to estimate the distances of most distant galaxies, rather than using white dwarf supernovae in all cases? |
We have not observed white dwarf supernovae in most galaxies |
|
