The first ancient civilization able to predict eclipses were the
A) Mayans
B) Egyptians
C) Chinese
D) Babylonians
D
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What astronomical object is the most important source for determining the age of our Solar System?
a. lunar rocks b. Earth core samples c. meteorites d. meteors e. asteroids
The radio lobes that are on each side of some radio galaxies and jets from them produce mainly
a. 21-cm radiation. b. synchrotron radiation. c. black body radiation. d. emission lies due to hydrogen. e. absorption lines due to hydrogen.
Where does most of the radio emission in a radio galaxy come from?
A. the spiral arms B. a thin shell surrounding the galaxy C. the center D. outside the galaxy in radio lobes
Because the rotational inertia is higher, it is hardest in springboard diving to perform a forward somersault in
A. the tuck position (bending at both the waist and knees). B. the pike position (bending at the waist but not the knees). C. the straight position (no bending at knees or waist).