High mass stars can fuse in their cores
A) all of the chemical elements
B) elements up to and including iron
C) elements up to and including carbon
D) only elements heavier than iron
B
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A camera is used to photograph the full moon, which has an angular diameter of 0.53°. The image on the film is 2.3 mm in diameter. What is the focal length of the lens?
a. 2.3 mm b. 500 mm c. 250 mm d. 790 mm e. 25.5 mm
The flatness problem and horizon problem
a. are solved if there was a sudden inflation of the Universe at time before recombination occurred. b. show that the Universe can be described as static and unchanging. c. show that dark matter must be a small fraction of the total mass of the Universe. d. imply that the Universe was once much colder than it is now. e. imply that the inflationary theory is incorrect.
What are the three key necessities for all life on Earth?
A) (1) nutrients, (2) energy, (3) liquid water B) (1) liquid water, (2) carbon, (3) oxygen C) (1) nutrients, (2) liquid water, (3) oxygen D) (1) DNA, (2) mutations, (3) liquid water E) (1) DNA, (2) liquid water, (3) oxygen
When astronomers began searching for extrasolar planets, they were surprised to discover Jupiter-sized planets much closer than 1 AU from their parent stars. Why is this surprising?
a) These planets must have formed at larger radii where temperatures were cooler and then migrated inward. b) Jupiter-sized, rocky planets were thought to be uncommon in other solar systems. c) These planets must be the remnants of failed stars. d) Earth-like planets must be rarer than Jupiter-sized planets in other solar systems. e) It is different than in our Solar System.