Many pulsars have periods that are gradually getting longer as the spinning neutron stars lose energy
a. True
b. False
Indicate whether the statement is true or false
True
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Coal reserves in the United States are expected to last for
A. hundreds of years B. three or four decades C. 72 years D. less than a decade
When an aging massive star generates an iron core, the iron cannot fuse and thus the star cannot support its weight outside the core. The star is no longer in hydrostatic equilibrium and collapses, forming a supernova
a. True b. False Indicate whether the statement is true or false
The resolution of a microscope can be most improved by
A. increasing the wavelength and diameter of the lens. B. decreasing the wavelength and the diameter of the lens. C. decreasing the wavelength and increasing the diameter of the lens. D. increasing the wavelength and decreasing the diameter of the lens.
The Local Group is slightly more than _____ in diameter
A) 1 Mpc B) 2 Mpc C) 3 Mpc D) 4 Mpc