X-ray observations of elliptical galaxies reveal large amounts of very hot ________ in their interior
Fill in the blank(s) with correct word
interstellar gas
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Upper-main-sequence stars, more massive than the Sun, fuse hydrogen by the proton-proton chain
Indicate whether the statement is true or false
Reaction forces are given in terms of load variable P for the truss below. The force in member FD is:
(A) 1.47P
(B) 2.27P
(C) 22.27P
(D) 24.27P
Which of the following features of the Solar System does the solar nebula hypothesis explain?
A. All the planets' orbits lie in nearly the same plane. B. All the planets orbit the Sun in the same direction. C. The planets nearest the Sun contain only small amounts of substances that condense at low temperatures. D. All of these choices are correct.
A planet (or comet) will speed up as it approaches the Sun
Indicate whether the statement is true or false