The time interval from one vernal equinox to the next is called one ______________ year
a. sidereal
b. celestial
c. solar
d. tropical
d
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Outflow channels on the Martian surface have remain unchanged since their formation
Indicate whether the statement is true or false
_____ is the closest planet to the Sun
A) Earth B) Venus C) Mercury D) Mars
Which of the following happens when a star runs out of hydrogen at its center?
A) The core of the star expands. B) The outer layers of the star heat up. C) The star moves toward the lower left in the Hertzsprung-Russell diagram. D) The stellar core becomes almost pure helium
X-rays with an energy of 400 keV undergo Compton scattering from a target. The scattered rays are deflected at an angle of 38° relative to the direction of the incident rays.What is the energy of the scattered x-rays?
a. 343 keV b. 300 keV c. 400 keV d. 2410 keV