A satellite near Earth makes a full circle in about 90 minutes. Much farther from Earth, say at the distance to the Moon, time for a full circle would be
A) 90 minutes.
B) less than 90 minutes.
C) about 28 days.
D) not enough information
E) none of the above
Answer: C
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An 05 star has an H? line present in its spectra. What color is the line?
a. red b. no color as the line is in the UV band c. blue d. no color as the line is in the infrared band
The temperature at the bottom of Lake Tahoe, high in the Sierra Mountains in California, at this moment is
A) below 4°C. B) 4°C. C) above 4°C. D) uncertain.
Breadcrumb trails are best suited to large websites with a hierarchical structure.
Answer the following statement true (T) or false (F)
What is thought to prevent the formation of stars with masses larger than about 300 times that of our Sun?
A) Molecular clouds do not have enough material to form such massive stars. B) Such massive stars would fragment into binary stars because of their rapid rotation. C) Such massive stars would generate so much light that radiation pressure would blow them apart. D) The onset of degeneracy pressure would prevent such massive stars from forming.