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Of the following types of radiation, which has the smallest (i.e., the least energetic) photons or quanta?
Radio waves
-
Sunspots are associated with distortions in the Sun’s
magnetic field
-
Of the many complex molecules found in interstellar space, most are based on which element?
Carbon
-
What is a common use for an interferometer in observational astronomy?
To improve the angular resolution of radio telescopes
-
When the Moon is at third quarter, what time will it rise?
Midnight
-
**The “helium flash” occurs at what stage in stellar evolution?
Red giant
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What two observations of an object allow for a determination of the Milky Way's mass?
An object's velocity and distance from the galactic center
-
The Sun rotates once in approximately one
month
-
The so-called “cosmological principle” is simply the idea that the basic large-scale features of the universe
are the same regardless of location
-
Ultraviolet radiation is of ________ than red light.
higher frequency and shorter wavelength
-
Quasars have their distances measured by what technique?
Hubble Law
-
**Which of the following are not intrinsic variable stars?
Eclipsing variables
-
What would Jupiter have needed to have become a star?
More mass
-
The time required for a photon to travel across our galaxy is about _____ years.
- 160,000 years
- (the middle one)
-
Suppose that in the spectrum of a star the spectral lines are observed to be alternately single and then double in a periodic fashion. The star is probably
a spectroscopic binary.
-
Beyond 100 parsecs, the distances determined by the method of trigonometric parallaxes become very unreliable because
the parallax angles become too small to measure accurately.
-
The Ptolemaic system accounts for retrograde motion by
having the planets travel on epicycles.
-
**The constellations that are visible in the early evening gradually change throughout one year due to the
revolution of the Earth about the Sun
-
An often-observed meteor shower, like the Leonids
is visible on approximately the same date each year.
-
The Pleiades cluster of stars is an excellent example of a
galactic or open cluster.
-
A galaxy is at a distance of one billion light years. Which of the following is true?
We see the galaxy the way it was one billion years ago.
-
In the Drake equation, a technological civilization is considered to be
a civilization that can communicate over interstellar distances.
-
All of the following may be used to estimate the solar surface temperature except
Kepler's laws.
-
Why does a star of type G5 have many absorption lines in its spectrum due to metallic elements such as iron, silicon, titanium, etc., while a star of type B5 shows very few lines of such elements?
The B star is very hot and nearly all of its metallic atoms are ionized, which makes them incapable of absorbing photons having visible wavelengths.
-
Galileo discovered all of the following except
the planet Uranus.
-
**The differences in stellar spectra are due primarily to differences in
temperature.
-
A star that is responsible for causing a nebula to fluoresce (i.e., emit an emission spectrum) is most likely a star of type
O or B (cause they're hot)
-
The gravitational attraction between two bodies depends on the distance, r, between them. The attraction varies with the distance as
1/r2. (the most complex one)
-
**The North Star does not appear to move during the night because
it lies approximately over the northern axis of the Earth.
-
The type of intrinsic variable stars often found in globular clusters are known as ________ stars.
RR Lyrae
-
The ancients thought that rest (i.e., no motion) was the natural state for a material body. Newton's ________ law states that uniform linear motion is just as natural as rest.
first
-
**What do we learn from the Doppler shift when we observe the spectrum of a star?
The star's radial velocity
-
In general, the tail of a comet streams away from the comet in a direction
away from the Sun.
-
A star with a spectral type of B2V would be referred to as which of the following?
Upper main sequence
-
The absolute magnitude of the Sun is about
+5.
-
**If an object is moving toward you, what effect do you observe in the spectrum of that object?
It appears blue-shifted.
-
The observed slowing of a clock in the vicinity of a black hole is a prediction of
general relativity.
-
**On March 21, the right ascension of the Sun is about
0 hours.
-
**All stars of spectral type G2 have approximately the same
temperature.
-
Which type of galaxy has a stellar disk, but without gas or dust?
S0
-
Which of the following are not found in the galaxy's spiral arms?
Globular clusters
-
Pair production can occur if
the energy of two photons is greater than the combined mass-energy of a particle-antiparticle pair.
-
Would the Moon be a good place to do astronomy?
Yes, because it lacks an atmosphere.
-
Cepheid variable stars are useful as distance indicators because they show a definite, simple correlation between their period of light variation and their
average absolute magnitude.
-
The law of universal gravitation was developed by
Newton.
-
One wavelength that may provide contact with extraterrestrial civilizations is found at
21 cm
-
“Conservation of angular momentum” means that a spinning body tends to
keep spinning.
-
Boston is 90° east of Hawaii. If it is noon in Hawaii, in Boston it would be about
sunset
-
What do all kinds of electromagnetic (i.e., radiant) energy have in common?
All have the same speed in a vacuum.
-
A star that shows evidence of molecules in its spectrum would be considered
very cool.
-
All eclipsing binaries are also
spectroscopic binaries.
-
Ten parsecs is the standard distance that has been selected as the basis for defining the astronomical scale of
absolute magnitudes
-
How to find magnification from focal lengths
Lens (in inches)/eyepiece
-
How do the escape velocities of the Jovian planets compare to those of the terrestrial planets?
The Jovian planets have much higher escape velocities.
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