Earth from Space
Lead Author(s): Linda Khandro, Washington State Colleges
Source: Open Course Library
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An astronomy question pack by Linda Khandro.
This content is licensed under the Creative Commons Attribution 3.0 Unported License.
The average distance from Earth to the sun is
1 million km
1 million miles
The sun is
1 AU from Earth.
more than 100 times the diameter of Earth.
all of the above
The diameter of the sun is approximately ______________ times larger than the diameter of Earth.
A galaxy contains
lots of gas and dust but very few stars.
gas, dust, and stars.
a single star and planets.
The Milky Way Galaxy
contains about 100 billion stars.
is about 200 light-years in diameter.
is the largest known object in the universe.
all of the above
2.9×10 is the same as
1.65 billion is the same as
In March 2012, a supernova (exploding star) was seen in a galaxy located 38 million light years away. How long ago did the supernova explode?
3800 years ago
38,000 years ago
38 million years ago
38 billion years ago
If the distance to the nearest star is 4.2 light-years, then
the star is 4.2 million AU away.
the light we see left the star 4.2 years ago.
the star must have formed 4.2 billion years ago.
the star must be very young.
The Milky Way Galaxy is
a spiral galaxy.
part of a cluster of galaxies that contains a few dozen galaxies.
about 75,000 light years in diameter.
all of the above.
Seen from the northern latitudes, the star Polaris
is never above the horizon during the day.
always sets directly in the west.
is always above the northern horizon.
is never visible during the winter.
The celestial equator is
a line around the sky directly above Earth's equator.
the dividing line between the north and south celestial hemispheres.
the path that the sun appears to follow on the celestial sphere as Earth orbits the sun.
a and b.
The ______________ is the point on the celestial sphere directly above any observer.
north celestial pole
south celestial pole
The apparent visual magnitude of a star is 7.3. This tells us that the star is
one of the brighter stars in the sky.
bright enough that it would be visible even during the day.
not visible with the unaided eye.
very far from Earth.
Which of the following stars appears brightest in the sky to us?
Sirius at apparent magnitude -1.4
Deneb at apparent magnitude 1.25
Betelgeuse at apparent magnitude 0.42
Antares at apparent magnitude 0.96
A(n) \_\_\_\_\_\_\_\_\_\_\_\_\_\_ is one-3,600th of a degree.
second of arc
minute of arc
Precession of the rotation axis of Earth is caused by
the force of gravity from the sun and moon on Earth's equatorial bulge.
the force of gravity from the sun and Jupiter on the Earth-moon system.
the magnetic field of Earth.
the formation and subsequent melting of glaciers during the ice-ages.
An observer in the Northern Hemisphere watches the sky for several hours. Due to the motion of Earth, this observer notices that the stars closest to the north celestial pole appear to move
counter clockwise around the celestial pole.
clockwise around the celestial pole.
from left to right.
from north to south.
You live at a latitude of 28° N. What is the angle between the northern horizon and the north celestial pole?
If the north celestial pole appears on your horizon, what is your latitude?
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