Pluto is no longer classified as a planet; instead it is classified as a(n) ____________________
Fill in the blank(s) with correct word
dwarf planet
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On the H-R diagram, lines of constant radius are illustrated as _____
a. sloping downward from right to left b. sloping downward from left to right c. running vertically on the right side d. running horizontally on the top e. moving in various direction depending on the type of star
(b) The space time interval between events A and C is:
A. Time like B. Light like C. Space like
One 20-year-old twin brother takes a space trip with a speed of 0.80c for 30 years according to a clock on the spaceship. Upon returning to the Earth, what is his own age and the age of the Earth-based twin brother?
A) 20; 30 B) 30; 50 C) 40; 60 D) 50; 70 E) 70; 90
Which statement correctly describes the role of dark matter in galaxy formation?
A) Where baryons collect, dark matter follows. B) Dark matter plays very little role in galaxy formation. C) Where dark matter collects, the baryons follow.