The type of radiation coming from active nuclei due to electrons spiraling in very strong magnetic fields at relativistic speeds is:
A) positron radiation.
B) thermal energy.
C) a blackbody curve.
D) synchrotron radiation.
E) nuclear energy.
D
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The elements that we are all made of are common everywhere in the observable Universe
a. True b. False Indicate whether the statement is true or false
The proper motion of a star is its true velocity through space
Indicate whether the statement is true or false
A 50-kg satellite circles the Earth in an orbit with a period of 120 min. What minimum energy is required to change the orbit to another circular orbit with a period of 180 min? (Earth: radius = 6.4 × 106 m, mass = 6.0 × 1024 kg)
A. 2.9 × 108 J B. 3.5 × 108 J C. 4.1 × 108 J D. 4.7 × 108 J E. 5.9 × 108 J
Why are Cepheid variables important to understanding the formation of the Universe?
A) Because they rotate at known speeds. B) Because their brightness is a function of distance from Earth. C) Because their luminosity is a function of their pulsation period. D) Because they are at known distances from Earth.