Miscellaneous Flashcards
(22 cards)
Can An object with mass travel at the speed of light?
No
Two reference frames with the same acceleration are _____.
Equivalent
Of light bends, then space ____.
Curves.
If three dimensional space is curved, then it must curve into a ______ ______.
Fourth dimension
The Milky Way contains ________ stars and has a mass of _______ Suns.
100 billion
400 billion
From side to side, the Milky Way is _______ long.
100,000 light years
The sun is _____ from the galactic core.
12,000 light years
We orbit the galaxy every ______ years.
250 million
Measurements of the positions of what confirms these statistics?
Globular clusters
How do we measure the distance to very distant stars?
Cepheid variables
The period of variation in a stars luminosity is a measure of its ______ ______.
Absolute luminosity
Which galaxy is not apart of the Milky Way?
Andromeda Galaxy
Who first measured cepheid variable stars?
Hubble
What color is the center of a spiral galaxy?
What color are the arms of a spiral galaxy?
Yellow
Blue
Where does active star formation occur? The arms aren’t structures but…
In the arms
Density waves
What is at the center of the Milky Way?
A giant black hole
Do the speeds of stars about the center of the Milky Way correspond with keplers laws?
No
What are the two possibilities of mass that we can’t see?
MACHOS and WIMPS
What are MACHOS and WIMPS?
MACHOS are massive but dark objects made of ordinary matter
WIMPS are some sort of matter that is unknown
Hubble space telescope studies indicated that the matter cannot be what?
MACHOS
We can’t see dark matter because why?
It doesn’t interact with light
Time _____ at great speed.
Slows
