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45 Cards in this Set

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Where on Earth would you be if Polaris was at your zenith?
North Pole
What is the range of values for declination?
+90 to -90 degrees
What is the range of values for Right Ascension?
0 to 23 hours
If the Moon rose tonight at 6 PM, then tomorrow it will rise about:
7pm
Which of the following describes parallax?
It is inversely proportional to the distance to the star.
Which of the choices below correctly lists things in order from largest to smallest?
Universe, Local Group, Milky Way, Solar System
Where on Earth can you observe all the stars in the sky over an entire year?
Equator
While watching a star, you see it moves 15 degrees across the sky. How long have you been watching it?
1 hour
How long is the precession cycle?
26,000 years
A year is defined as
the time it takes for Earth to complete an orbit around the Sun.
That Polaris will not always be the pole star is due to
precession shifting the celestial pole.
When the Moon is directly opposite the Sun in the sky, its phase is
full
Where would you be if the Sun sets for six continuous months, beginning on September 23rd?
north poll
A solar eclipse can only happen during a
new moon
The star Wolf 1061 has a parallax of 2.34 arcseconds, while the star Ross 652 has a parallax of 1.70 arcseconds. What can you correctly conclude?
Wolf 1061 is closer to Earth than Ross 652.
Scientists today do not accept the Ptolemaic model because:
the work of Tycho and Kepler showed the heliocentric model was more accurate.
According to Copernicus, the retrograde motion for Mars must occur
at opposition, when the earth overtakes Mars and passes between Mars and the Sun.
Which of the following is a contribution to astronomy made by Galileo?
The astronomical telescope can show us far more detail than the eye can.
Jupiter has four moons orbiting it.
The Moon has craters, mountain, valleys, and dark flat areas on its surface.
Venus appears almost fully lit when it lies on the far side of the Sun.
Galileo found the rotation period of the Sun was approximately
a month
In Ptolemy’s Earth-centered model for the solar system (not shown), Venus’s phase is never full as viewed from Earth because it always lies between Earth and the Sun. In reality, as Galileo first recognized, Venus is __________.
full whenever it is on the opposite side of the Sun from Earth, although we cannot see the full Venus because it is close to the Sun in the sky
Imagine that Venus is in its full phase today. If we could see it, at what time would the full Venus be highest in the sky?
noon
When would a new Venus be highest in the sky?
noon
When would you expect to see Venus high in the sky at midnight?
never
In Ptolemy’s Earth-centered model for the solar system (not shown), Venus always stays close to the Sun in the sky and, because it always stays between Earth and the Sun, its phases range only between new and crescent. The following statements are all true and were all observed by Galileo. Which one provides evidence that Venus orbits the Sun and not Earth?
We sometimes see gibbous (nearly but not quite full) Venus
The force of gravity between two objects
increases with the masses of the bodies, but decreases with the square of the distances between them.
How much stronger is the gravitational pull of the Sun on Earth, at 1 AU, than it is on Saturn at 10 AU
100X
Kepler's first law worked, where Copernicus' original heliocentric model failed, because Kepler described the orbits as
elliptical, not circular
The place in a planet's orbit that is closest to the Sun is called
perihelion
A wave's velocity is the product of the
frequency times the wavelength of the wave.
If a wave's frequency doubles, its wavelength
is halved.
The temperature scale that places zero at the point where all atomic and molecular motion ceases is
kelvin
Of all the forms of electromagnetic radiation, the one with the lowest frequency is
radio waves
The two forms of electromagnetic radiation that penetrate the atmosphere best are
visible and radio waves.
Colors appear different to us because of their photons' different:
frequencies.
Star A and star B have the same temperature, but different luminosities. What can you infer about these two stars
Nothing can be inferred from the information given
At which of these Kelvin temperatures would a blackbody radiate mostly at visible wavelengths
6000 K
The Doppler Effect is a phenomenon that allows one to measure an object's
radial motion
The element first found in the Sun's spectrum, then on Earth 30 years later, is
helium
A neon light (thin hot neon gas in a sealed tube) gives us
a few bright emission lines, telling us the gas is neon
The particles which enter into chemical reactions are the atom's
electrons
The particle which adds mass but no charge to the atomic nucleus is the:
neutrons
Since the difference in energy between the different rotational states in a
molecule is very small, many molecular lines can be observed with
radio or microwave telescopes
The observed spectral lines of a star are all shifted towards the red end of the spectrum.
Which statement is true?
This is an example of the Doppler effect.
An emission spectrum can be used to identify a(n)
atom
What information about an astronomical object can be determined by observing its spectrum?
whether it has a strong magnetic field
its radial motion
its temperature
its chemical composition