Stars that have masses similar to the Sun's, and sizes similar to the Earth are:
A) main sequence stars.
B) white dwarfs.
C) red giants.
D) red dwarfs.
E) brown dwarfs.
B
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The lifetime of a star is determined by its initial ______________
Fill in the blank(s) with correct word
In an isochoric process, the internal energy of a system decreases by 50J. What is the work done?
A. zero B. +50 J C. -50 J D. none of the above
Sunspots are dark because
a. regions of the photosphere are obscured by material in the chromosphere. b. shock waves move through the photosphere. c. the Sun rotates differentially. d. they are cooler regions than the photosphere. e. they radiate their energy into space faster than the rest of the photosphere.
The first-quarter phase of the Moon in the Northern Hemisphere occurs at the time of the third-quarter phase in the Southern Hemisphere.
Answer the following statement true (T) or false (F)