Which kind of telescope is shown?
a. infrared b. radio c. optical d. ultraviolet
Answer: B
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Novae always occur in a close binary star system
Indicate whether the statement is true or false
Radiation: The radius of a star is 6.95 × 108 m, and its rate of radiation has been measured to be 5.32 × 1026 W. Assuming that it is a perfect emitter, what is the temperature of the surface of this star? (? = 5.67 × 10-8 W/m2 ? K4)
A. 6.27 × 103 K B. 8.25 × 103 K C. 8.87 × 103 K D. 3.93 × 107 K E. 5.78 × 107 K
A planet is orbiting a star. Which of the following statements is true for the acceleration and gravitational forces experienced by the star and the planet?
A) The acceleration of the planet is much more than the acceleration of the star, but the force on the star is the same but opposite the force on the planet. B) The acceleration of the planet is much more than the acceleration of the star, and the force on the planet is much more than the force on the star. C) The force on the star is much smaller than the force on the planet, but the accelerations are about equal.
We get a new and full moon every month. Why don't we get two eclipses every month?
What will be an ideal response?