Virtually all the carbon-rich dust in the plane of the galaxy originated in
A) low-mass stars.
B) planetary nebulae.
C) high-mass stars.
D) brown dwarfs.
E) white dwarfs.
A
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Indicate whether the statement is true or false
How were the maria formed?
A. Maria were formed by ancient oceans on the Moon's surface. B. Maria formed from ash falls from long dead volcanoes. C. They were formed by the huge tidal interaction between Earth and Moon. D. Successive volcanic eruptions flooded huge basins formed by large impacts.
Suppose that the Sun—Earth distance were 10 AU instead of 1 AU. Then the energy of sunlight received per square meter on Earth each second would be ________ it is today.
A) 10 times as great as B) about the same as C) 1/100 as much as D) 100 times as great as E) 1/10 as much as
A mirror with a focal length 100 cm has a 4.0 cm object placed 20 cm in front of it. What is the height of the image?
A) -3.2 cm B) 3.2 cm C) 5.0 cm D) -5.0 cm E) 4.0 cm