PHYS 190 Study Guide - Quiz Guide: Solar Mass, Orion Nebula, Supernova Remnant
10 May 2018
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Department
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Professor
What is the average distance from the
Earth to the Sun?
1 Astronomical Unit
What is the ratio of the diameter of the
Sun to the diameter of the Earth?
100: 1
How many stars are in the Milky Way
galaxy?
about 100 billion
Which of the following has the
distances arranged in order from
smallest to largest?
-millimetre, kilometre, AU, lightyear
If the distance to the nearest star is 4.2
light years, what can we conclude
about the star?
-The star’s light takes 4.2 years to
reach us
What is the reason for compressing
the history of the universe into a single
year in the cosmic calendar?
to compare astronomical
timescales with human experience
Which sequence below is correctly
ordered from smallest to largest size?
-Earth, solar system, milky way,
clusters of galaxies
If an object is 1,000 light years away,
how do we see it?
as it looked, 1,000 years ago
What is the celestial equator?
-the dividing line between the north
and south celestial hemispheres?
What is the term for the point on the
celestial sphere directly above an
observer, no matter where on the
Earth the observer is located?
-zenith
What is the purpose of the magnitude
scale?
-It measure the apparent
brightness of a celestial object
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If the apparent visual magnitude of a
star is 7.3, what does this tell us about
the brightness of the star?
-It is most visible with the unaided
eye
Which of the following is equivalent to
one-3,600^th of a degree?
-a second of arc
Which of the following best describes
the Big Dipper?
-an asterism
An observer ion the northern
hemisphere watched the sky for
several hours. Due to the motion of the
Earth, this observer notices that the
stars near the north celestial pole
appear to move. What pattern does
this apparent movement follow?
-counter-clockwise around the
celestial pole
If the north celestial pole appears on
your horizon, what is your latitude?
-0degrees
What do stars in the same
constellation have in common?
-they are in the same part of the
sky as seen from the Earth
During the month of June the north
celestial pole points towards polaris;
where does it point during the month
of December?
-still towards Polaris
Why are Northern Hemisphere winters
colder than Northern Hemisphere
summers?
-the light from the sun shines more
directly on the northern
hemisphere during the summer
At which of the following times would
you find the Sun on the celestial
equator?
-autumnal equinox and vernal
equinox
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What is the ecliptic?
-the projection of the Earth’s orbit
on the sky
At what two celestial locations do the
celestial equator and the ecliptic
coincide?
-vernal equinox and autumnal
equinox
Which of the following describes a
concept very similar to latitude?
-declination
What is the term for the period of time
it takes for the Moon to complete a
cycle of the lunar phases that is
approximately 29.5 days long?
-synodic period of the Moon
What is the sidereal period of the
Moon?
the period of time for the moon to
orbit the Earth once with respect to
the stars
What is the term for a solar eclipse in
which the Moon’s umbra does not
reach the Earth’s surface?
an annular solar eclipse
When and where is a waxing crescent
Moon Visible?
-near the western horizon just after
sunset
Where is a total lunar eclipse visible?
-It is visible to all observers on the
side of the Earth facing the Moon
When do total lunar eclipses always
occur?
-at the time of full Moon
The moon has an angular diameter of
0.5 degrees. What is the Moon’s
angular diameter in minutes of arc?
30
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Document Summary
What is the ratio of the diameter of the. How many stars are in the milky way galaxy? about 100 billion. The star"s light takes 4. 2 years to reach us. What is the reason for compressing the history of the universe into a single year in the cosmic calendar? to compare astronomical timescales with human experience. Earth, solar system, milky way, clusters of galaxies. If an object is 1,000 light years away, how do we see it? as it looked, 1,000 years ago. What is the term for the point on the celestial sphere directly above an observer, no matter where on the. It measure the apparent brightness of a celestial object. It is most visible with the unaided eye. An observer ion the northern hemisphere watched the sky for several hours. Earth, this observer notices that the stars near the north celestial pole appear to move.
