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Astr 005 Assignments 8 - 12

Terms in this set (36)

The velocity of sound in air will always be the same when measured from the frame of the reference of the ____.
Air
The 18th century, we did not know if the "ether" could exist in _____.
Steel
Michelson and Morley rotated their interferometer to _____.
See the interference pattern move
The speed and direction of light you measure from a fast-moving flashlight is ____ compared to he light from one held in your hand.
Exactly the same
Results of experiments done in 2 rockets moving inertially at 100,000 miles/hour past each other will be ____.
All identical
A meter stick flies by you lengthwise at 50% the speed of light and you measure its length. You get ___ meter(s).
0.866
Because of relativity, you will see a man speeding past you living slower than you. He sees you living ____ than (as) him.
Slower
The dimensions of space and time are curved by _____.
Massive Objects
As we orbit the sun, stars will appear to be eclipsed by it for a(n) ___ time due to relativity.
Shorter
Reversing time should make an electron look like ____.
An anti-electron
A sun like star is seen to dim by 1% every time an exoplanet passes in front of it. The diameter of the planet is closest to ___ km.
140,000
If our Milky Way galaxy were the diameter of a 1-inch diameter quarter, the Andromeda galaxy would be about ___ inches away.
25
You weigh 150 lbs. You fly to a white dwarf star the size of Earth and stand on its surface. It has 1/3 the mass of the sun, and you can assume the sun is 300,000 times the mass of Earth. Your weight there is ___ lbs. (Your body is not white dwarf density as in the slides)
Fifteen million
The nature of degenerate gas pressure might lead you to suspect that more massive white dwarfs are ___ than lower mass ones.
Smaller
Evidence that the uncertainty principle is more than just an observational limit can be found in ___.
White dwarf stability
Stars more than 1.4 times the mass of the sun cannot become white dwarfs because (of) ____.
Relativistic corrections
Supernovae happen about once every ___ on average in a galaxy like ours.
Century
The major difference between what Jocelyn Bell found and what she was looking for in her PhD work was ____.
Periodicity
Pulsars cannot be explained by rotating white dwarfs because white dwarfs ____.
Aren't dense enough
We determine that a pulsar's rotation period is twice its pulse period. This implies that ____.
Its rotation and magnetic axes are perpendicular
Pulsar "spin-down" is caused by ___.
Light cone energy loss
We can have neutron stars below 1.4 solar masses because of ___.
Supernovas
A large exoplanet has 0.0033 solar mass (-3X Jupiter). Its event horizon radius is about ___.
10 meters
Theoretically, you could determine if a stellar black hole has a non-zero net electric charge by looking for ____.
Movement of charged particles
The gamma ray bursts astronomers have observed indicate ____.
None of the following answers: That mini black holes exist, there's a lifespan for black holes, that galactic black holes exist
We see x-ray emission from binary star systems containing a black hole. We think it originates in (on) the ____.
Inner accretion disk
The first galactic black hole discovery would not have been possible if _____.
We saw that galaxy "face on"
The EHT black hole image published in 2019 gives us clear evidence of _____.
It's surrounding space curvature
The Oct 2015 LIGO "chirp" did NOT confirm ____.
Galactic black holes
A Schwarzschild type black hole has non-zero values of only ____.
Mass
A Penrose diagram of a Schwarzschild black hole actually shows ____.
One black holes accessible by two universes
When our galaxy merges with Andromeda, we can expect _____.
Intense star formation to start
To map spiral arms in the Milky Way, we can measure the _______.
Distances to O and B stars
We think that most star formation in the Milky Way starts _____.
On the inside edges of spiral arms
In other galaxies, low mass stars are seen everywhere because _______.
They live so long
We think galactic spiral arms originate because of ______.
Companion galaxies
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