William Herschel discovered the green disk of ________ as the first telescopic planet
Fill in the blank(s) with correct word
Uranus
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Time Dilation: Astronaut Rob leaves Earth in a spaceship at a speed of 0.960c relative to an observer on Earth. Rob's destination is a star system 14.4 light-years away (one light-year is the distance light travels in one year). Relative to a frame of reference that is fixed with respect to Earth, how long does it take Rob to complete the trip?
A. 14.4 years B. 15.0 years C. 10.8 years D. 4.20 years E. 22.7 years
On average, how often do impactors about 10 km in size, large enough to produce mass extinction, hit Earth?
A) once every century B) once every thousand years C) once every million years D) once every hundred million years E) once in Earth's history
During the red giant phase, a star's mass ________
Fill in the blank(s) with correct word
A heavy stone and a light stone are released from rest in such away that they both have the same amount of gravitational potential energy just as they are released. Air resistance is negligibly small
Which of the following statements about these stones are correct? (There could be more than one correct choice.) A) The initial height of the light stone is greater than the initial height of the heavy stone. B) The stones must have been released from the same height. C) The stones both have the same speed just as they reach the ground. D) Just as it reaches the ground, the light stone is traveling faster than the heavy stone. E) The stones both have the same kinetic energy just as they reach the ground.