A(n) ____________________ is a rapidly spinning neutron star that accelerates charged particles near the poles of its magnetic field
Fill in the blank(s) with correct word
pulsar
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Kepler's second law is about the speed of planets, where planets move faster at perihelion and slower at aphelion
a. True b. False Indicate whether the statement is true or false
The greatest contribution of the Greeks to modern thought was:
A) the idea that all the planets orbited the Sun. B) that their mythology was the basis for the naming of the constellations. C) that their observation of stellar parallax proved the Earth orbited the Sun. D) the development of scientific inquiry and model building. E) the invention of the telescope.
Why do astronomers often measure the visible-light apparent brightness instead of the total apparent brightness of a star?
A) All stars put out most of their light in the visible range of the spectrum. B) In order to measure the total apparent brightness of a star, you must measure its brightness in all wavelengths, and this is difficult to do. The only wavelengths you can measure from the surface of Earth are visible and radio wavelengths. C) Most stars do not put out light in other ranges of the spectrum. D) They are identical for most stars. E) Astronomers are lazy.
Is the burning of a match an exothermic reaction?