a type of star cluster that contains mostly very old stars is
What will be an ideal response?
a globular cluster
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What type of lens is used in a pinhole camera?
A. Converging B. Diverging C. Spherical D. No lens is used
The ancient Greeks get a lot of attention for their contributions to science because
A) they were the first people known to try to explain nature with models based on reason and mathematics, without resort to the supernatural. B) the books of every other culture were lost in the destruction of the library of Alexandria. C) they were the first people to realize that Earth is a planet orbiting the Sun. D) they were the only ancient culture that kept written records of their astronomical observations.
The mass of an atom is
A) approximately equally divided between protons and electrons. B) approximately equally divided between neutrons, protons, and electrons. C) evenly divided between the nucleus and the surrounding electron cloud. D) concentrated in the cloud of electrons surrounding the nucleus. E) concentrated in the nucleus.
Suppose you repeated the famous COBE and Planck observations of the cosmic microwave background, with a slight different observational setup, to check their results. Which of the following observations would be surprising and contradict earlier findings?
A) You find that cosmic microwave background has a temperature of 2.73 K. B) You find that cosmic microwave background has an almost perfect thermal spectrum. C) You find that cosmic microwave background contains redshifted emission lines of hydrogen and helium. D) You find that cosmic microwave background looks essentially the same in all directions. E) You find that cosmic microwave background has tiny temperature fluctuations at the level of about 1 part in 100,000.