MSU ISP 205 COMPREHENSIVE TEST BANK
FULLY SOLVED QUESTIONS AND
SOLUTIONS
●● Are we ever sitting still?
Answer: No
Earth orbits Sun: > 100,000 km/hr
Solar system moves among stars: ~ 70,000 km/hr
Milky Way rotates: ~ 800,000 km/hr
Milky Way moves
in Local Group
Universe
expands
●● Light-Year
Answer: the DISTANCE light can travel in a year.
,About 10 trillion km (6 trillion miles)
●● How can we know what the universe was like in the past?
Answer: Light travels at a finite speed (300,000km/s)
Moon - 1 second (light travel time)
Sun - 8 minutes
Sirius - 8 years
Andromeda Galaxy - 2.5 million years.
We see objects as they were in the past: the farther away we look in
distance, the further back we look in time.
●● Zenith
Answer: The point
directly overhead
(altitude = 90 deg.)
●● Horizon
Answer: All points 90°
away from zenith
(altitude = 0 deg.)
, ●● Meridian
Answer: Line passing through zenith
and connecting N and
S points on the horizon
●● Full circle =
Answer: 360 degrees
●● 1º =
Answer: 60′ (arcminutes)
●● 1′ =
Answer: 60″ (arcseconds)
●● Stars near the north celestial pole are?
Answer: circumpolar and
never set.
●● Can we see stars near the south celestial pole?
Answer: No. They never rise
●● All other stars (and Sun, Moon, planets) rise
FULLY SOLVED QUESTIONS AND
SOLUTIONS
●● Are we ever sitting still?
Answer: No
Earth orbits Sun: > 100,000 km/hr
Solar system moves among stars: ~ 70,000 km/hr
Milky Way rotates: ~ 800,000 km/hr
Milky Way moves
in Local Group
Universe
expands
●● Light-Year
Answer: the DISTANCE light can travel in a year.
,About 10 trillion km (6 trillion miles)
●● How can we know what the universe was like in the past?
Answer: Light travels at a finite speed (300,000km/s)
Moon - 1 second (light travel time)
Sun - 8 minutes
Sirius - 8 years
Andromeda Galaxy - 2.5 million years.
We see objects as they were in the past: the farther away we look in
distance, the further back we look in time.
●● Zenith
Answer: The point
directly overhead
(altitude = 90 deg.)
●● Horizon
Answer: All points 90°
away from zenith
(altitude = 0 deg.)
, ●● Meridian
Answer: Line passing through zenith
and connecting N and
S points on the horizon
●● Full circle =
Answer: 360 degrees
●● 1º =
Answer: 60′ (arcminutes)
●● 1′ =
Answer: 60″ (arcseconds)
●● Stars near the north celestial pole are?
Answer: circumpolar and
never set.
●● Can we see stars near the south celestial pole?
Answer: No. They never rise
●● All other stars (and Sun, Moon, planets) rise
