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Astronomy Test 1
Terms in this set (38)
What fraction of the sky could you see from the North Pole of the Earth?
What fraction of the sky could you see from the Earth's equator over the course of a year?
All of it
A set of phases similar to those seen by Galileo for Venus are also technically possible for which planet?
Virgo is visible during _____
Sagittarius is visible during ____
Taurus is visible during ____
Nicolaus Copernicus is responsible for:
Heliocentric Model, Distance of Planets
Galileo is responsible for:
Phases of Venus, Moons of Jupiter
Hipparchus is responsible for:
Eratosthenes is responsible for:
Size of the Earth
The Earth revolves around the Sun in 365.25 days (this is a year). Because of this motion, the Sun appears to move through a 360 degree circle among the stars over this same time. How many degrees does the Sun move in a day with respect to the stars? Round your number to the nearest degree.
Why did Copernicus want to develop a completely different description of the Solar System?
Inaccurate positions of planets, simpler version of planet orbits
What planet has the largest speed as it orbits the sun?
What describes the semi-major axis of an ellipse?
1) Half of distance across the longest line through the ellipse
2) The distance from the center of the ellipse to an edge pointing through a focus of the ellipse.
3) The average distance from planet to Sun.
A planet with a semi-major axis of 4 AU would have a period of ____ years.
Two asteroids orbit each other. The first has a mass that is twice as large as the other. We can compare the forces each would feel when only under the influence of the other. Which statement is true?
The force the larger asteroid feels is equal to the force felt by the other
An asteroid approaches the Sun and its distance has become half as much as it was under previous observation. Comparing the force of gravity to the previous observations tells us it is now ____
4 times the previous force
We can "weigh" or determine the mass of planets or stars by directly using ____
Newton's version of Kepler's Third Law
The Moon is between the Earth and Sun during which phase of the Moon?
The Moon does not cause a solar eclipse every month. This is best explained by:
The Moon's orbit is tilted with respect to the Earth's orbit.
The solstice during June exhibits all of the following characteristics from observation in Georgia
1) The longest amount of time described as daylight.
2) The Northern hemisphere is tilted in direction of the Sun.
3) The largest angle of the Sun measured from horizon at mid-day.
Observations from a telescope in Antartica would be limited by which of the following issues?
Stars near the North pole are not ever visible.
A full moon would be overhead around which time?
The Sidereal day explains why ____.
The stars rise earlier each day
The time for the Earth to orbit the Sun is 365.25 days. Therefore the modern calendar incorporates ______.
Rotation of the Moon (spin on its axis) _____.
is the same length of time as its own revolution period.
Eclipses occur while the Moon has reached the same plane as the Earth-Sun system during the new or full phases. An annular eclipse ____.
happens when the Moon is also farther than usual at the plane.
The Arctic is cold even during the summer "Midnight Sun". This can be explained by:
The angle of the Sun is always closer to the horizon than places closer to the equator.
The following wave properties distinguish the parts of the electromagnetic spectrum from each other:
wavelength, energy, frequency, (NOT SPEED)
As an object increases its temperature, the peak wavelength or color it appears would change according to which list (progressing from left to right) below ?
infrared, red, orange, yellow
The wavelength range on this list that gets its entire range through Earth's atmosphere is____.
Atoms emit light at the moment when ____.
electrons jump down to a lower energy level
A star's spectrum of hydrogen is observed from the Earth with wavelengths all shifted to longer wavelengths. The star is ______.
Moving away from Earth
When observing an animal in a dark forest, the animal could easily be seen with a camera utilizing ______.
A larger mirror on a reflecting telescope will ____
increase its light gathering power
The ability to separate object or details into distinct features is ____.
Radio telescopes have very large apertures when compared to optical instruments. Such apertures are needed to maintain
resolving power at longer wavelengths
Space telescopes of various wavelength capabilities are put into orbit to do all of the following except ____.
Get closer to their objects of study
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