Which of the following does not accurately describe what we observe toward the Galactic center?
A) at radio wavelengths, we see giant gas clouds threaded by powerful magnetic fields
B) at infrared wavelengths, we see a massive stellar cluster
C) at optical wavelengths, we see a cluster of old, red stars
D) at X-rays, we see faint emission from an accretion disk around a black hole
C
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Addition by 1. Components: Vector 
has a magnitude of 6.0 m and points 30° north of east. Vector 
has a magnitude of 4.0 m and points 30° east of north. The resultant vector 
+ 
is given by
A. 0.70 m at an angle of 42° north of east. B. 14 m at an angle of 42° north of east. C. 1.1 m at an angle of 42° north of east. D. 9.7 m at an angle of 42° north of east. E. 2.0 m at an angle of 42° north of east.
A car travels at 50.0 km/hr for 2.00 hours. It then travels an additional distance of 40.0 km in 1.00 hour. The average speed of the car for the entire trip is
A. 61.0 km/hr. B. 57.1 km/hr. C. 53.3 km/hr. D. 46.7 km/hr. E. 30.0 km/hr.
One observation that supported an Earth-centered solar system is ________.
A. the shape of Earth's shadow on the Moon B. the phases of the Moon C. retrograde motion D. the phases of Venus E. the lack of parallax in the stars
The tectonic surface features we see on Triton are similar to the grooves of Ganymede
Indicate whether the statement is true or false