Two stars have the same spectral type. Star X is in luminosity class III, while Star Y is in luminosity class V. Therefore, Star X is larger in radius than Star Y
Indicate whether the statement is true or false
TRUE
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Ross 128 is 1.1 times further than Ross 154 . As such, the parallax angle of Ross 128 is 0.9 times larger than Ross 154
a. True b. False Indicate whether the statement is true or false
Which two factors are most important to the existence of plate tectonics on Earth?
A) oxygen in the atmosphere and mantle convection B) Earth's liquid outer core and solid inner core C) the existence of life and oxygen in the atmosphere D) mantle convection and a thin lithosphere
In A.D. 1054, Chinese astronomers observed the appearance of a new star, whose location is now occupied by
a. a globular cluster. b. a planetary nebulae. c. a white dwarf. d. a young massive star. e. a supernova remnant.
Which of the following is that form of energy associated with an object's motion?
a. potential b. thermal c. bio-chemical d. kinetic