Terms in this set (96)
The stars in a constellation
only appear to be related
The significance of the constellations is
they were inherited from antiquity but have limited meaning
How many degrees does the Sun reach above the Earth's equator during Summer solstice?
Why don't we get eclipses during each full and new moon?
The moon's orbit plane is tipped to the equator
Who were the first to know the Earth was round?
is an undeniable conclusion of the scientific method
The point directly over an observer's head is that observer's
Polaris, the North Star, does not appear to move in the sky because
It lies approximately over the northern axis of the Earth
Viewed looking down upon the North Pole, the Earth would be seen rotating
If the Earth were inclined more on its axis than it currently is, what would be the consequences?
more drastic seasons
Why are there seven days of the week on our current calendars?
that was how many celestial objects in the sky moved with respect to other objects,
Aliens abduct me but then set me down at a different place on the Earth (I think). I observe the diurnal motion of the stars and note that they rise straight up in the East go overhead and set straight in the West. Where am I?
The apparent path of the sun around the celestial sphere against the background of the stars during the year is
The angular distance of an object from the horizon is its
What time of day does the first quarter Moon rise?
What is the approximate azimuth (az) elevation (el) of Mars just as it rises?
az= 90o, el= 10o
You can identify the Northern Star because
it is near the north celestial pole
Local noon corresponds to the time when the Sun is at the
A shift in the direction of an object caused by a change in the position of an observer is called
Why are there 12 months in a year on our current calendar?
there are 12 lunar cycles in a year
Retrograde motion is when
B. the apparent loop a planet makes in the sky when overtaken by another planet
In order to account for retrograde motion, the geocentric model had to
add another circle to a planets' orbit
Galilleo's observations of Venus showed
. phases like the Moon
What was special about Galileo's observation of Venus?
It proved Venus must orbit around the Sun
Which one of Kepler's laws explains what happens when a twilling ice skater brings their arms towards their center?
equal areas in equal times
What did Galileo's observations of the Moon reveal
The Moon had mountains, valleys, and craters
What was significant about Galileo's observations of the Planet Jupiter
He saw Moons in orbit which proved everything did not orbit around Earth
The fact that the Heliocentric model was simpler that the Geocentirc model is an example of
The Geocentric model endorsed by Aristole
used perfect circles
Galileo's observation of the Sun showed
that it rotated
This person invented calculus
Kepler's first law states
planets revolve around the Sun in elliptical orbits
Kepler's second law correctly predicts
planets are fastest when closest to the Sun
Newton's first law says object continue their current motion unless
forces act on them
According to Newton's 2nd law, what happens when forces are applied to an object
it undergoes acceleration
What will happen to the strength of the force of gravity between tow bodies if their distances is increased by a factor of three
it will decrease by a factor of 9
Because of Newton's 3rd law
we know the Earth applies an equal but opposite force to the Sun
Which applies the greatest force, the Moon on the Earth or the Earth on the Moon
they are the same
How do we determine the masses of planets around other stars
Kepler's 3rd law
In the absence of excitation, electrons in an atom tend to be
in the lowest allowed orbit
A device that breaks light up into it various colors is called
A police officer tells me that I my blue shift velocity exceeded posted limits. What does he mean?
you were speeding toward him
our bodies ordinarily emit
When an electron in an atom moves from a higher energy orbit to a lower energy orbit what happens
light is emitted
When a source is moving towards an observer emits a beam of light, how is it perceived by a observer
the light is bluer
Mike brags that he can touch a glowing light bulb without burning his fingers. What is probably true?
the bulb type is fluorescent
All wave phenomena are characterized by a wavelength, a frequency, and a velocity. They are related by the equation C = ln where C is the velocity of the wave, l is the wavelength, and n is the frequency. If I double the frequency of a wave, what happens to the wavelength
it decreases by a factor of 2
The frequency at which a star emits the most light depends upon the star's
Star a appears bluish white in color, while star b appears reddish in color. This tells you that
star a is hotter than star b
inferometry is used to increase
one advantage of a refracting telescope is
The ability of a telescope to image faint objects depends on the area of its lens. If I double the size of a circular telescope, what happens to its ability to image faint objects
increases by four
Spectral lines are sometimes referred to as the stars' "fingerprints" because
both are unique and characterisitc of that which has produced them
Large telescopes are reflecting rather than refracting because
mirror are easier to support than lenses
This kind of large telescope is cheaper to make
Why do astronomers want to observe in different parts of the spectrum
because they observe different physics
seeing refers t o
the smearing of an image caused by atmospheric motions
If I combine several telescopes together to synthesize a larger telescope I have created
The radio part of the spectrum is most sensitive to which component of the universe
which planet orbits fastest around the sun
When the sun appears to cross the equator from the south to the north this is called
Which color of the rainbow bends the most?
If we are at the autumnal equinox and I notice the sun is directly overhead at noon, what can I say?
I am at the equator
2. If the earth were inclined less on its axis than it currently is, what would be the consequences?
less drastic seasons
3. A planet in a highly elliptical orbit has its greatest speed when?
it is closest to the sun
4. What do we call the event when the Moon's shadow falls on the Earth's surface?
Your body radiates most strongly in what part of the electromagnetic spectrum?
Galileo's observations of the gibbous phase of Venus proved a) that Venus orbited the sun
that all of the planets orbited the sun
What time of day does the third quarter moon rise?
The autumnal equinox occurs in the month of
I wake up at midnight and see that the Moon is on my western horizon. What is the phase do I see?
All large modern telescopes are
What is the relative size of the Moon to the Earth?
1/3 as big
The reason for the seasons is the fact that:
the Earth's axis is tipped to its orbit,
The tropic of Cancer is where:
northern limit of the Sun's travel
In comparison to the temperature of the surface of the Sun, how hot is the filament of an incandescent light bulb?
3. Astronomer make their own stars for adaptive optics by:
When the sun appears to cross the celestial equator from the north to the south this is called
3. If we are at vernal equinox and I notice the sun is directly overhead at noon what can I say
I am at the equator
The observed changing positions of the stars during a night is the result of the
rotation of the Earth on its axis
The phases of the moon are caused by
different amounts of the illuminated half of the moon being visible from Earth
What do we call the event when the Earth's shadow falls on the Moon's surface
What time of day does the full Moon rise?
The average distance from Earth to the sun is
The vernal equinox occurs in the month of
The sun is highest (greatest declination) at the
If an object is moving away from you, what effect do you observe in the spectrum of that object?
it appears blue-shifted
I wake up in the middle of the night and notice that it is 12:00 midnight and that the Moon is on my eastern horizon. What is the phase of the Moon that I see?
I observe the spectra of a star and see that it periodically is red and then blue shifted what may I deduce
its atoms are vibrating
A light year is
the distance light travels in one year
England is about 1/4 of the way around Earth from Chicago. On a night when people in Chicago
see a full moon, people in England see
first quarter moon
Which constellation contains stars which "point" to the north star
Which event occurs more frequently?
With respect to the stars, the sun moves
about one degree eastward each day.
As the temperature of a black body increases, what happens to the peak in its blackbody spectrum?
it becomes more peaked
Why do electrons have discrete orbits?
they are not discrete, but continous