Helium has chemical properties similar to
A. hydrogen.
B. lithium.
C. neon.
D. boron.
Answer: C
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A future news release might report that a new planet has been found around a star very similar to our sun. This newly discovered planet is claimed to have a mass 40 times that of Earth and is located nearly 25 AU from the star it orbits. Which of the following would be a reasonable prediction about this planet? I. The planet will probably have a mean density of around 5 g/cm3. II. The planet will
probably have a radius of around five to ten times greater than Earth's. III. The planet will probably have several satellites. IV. The planet will probably have a composition that is mostly hydrogen and helium. a. I & IV b. I, II, & III c. II, III, & IV d. I, II, & IV e. I, II, III, & IV
Ocean tides are waves that have a period of 12 hours and a speed of 750 km/hr. What is their wavelength?
A) 9000 km B) 32,400 km C) 9000 m D) 32,400 m E) 2,500 m
Which of the following provides the strongest evidence that halo stars are older, on average, than disk stars?
A) Halo stars orbit in random directions, but disk stars have more ordered orbits. B) There are no blue halo stars. C) There are no red disk stars. D) Theories of galaxy formation tell us that the halo formed earlier than the disk.
The densest stars in the H-R diagram are the white dwarfs
Indicate whether the statement is true or false