The most basic difference between elliptical galaxies and spiral galaxies is that
A) elliptical galaxies lack anything resembling the disk of a spiral galaxy.
B) elliptical galaxies lack anything resembling the halo of a spiral galaxy.
C) spiral galaxies lack anything resembling the distribution of stars in an elliptical galaxy.
D) elliptical galaxies are old and spiral galaxies are young.
A) elliptical galaxies lack anything resembling the disk of a spiral galaxy.
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After reaching its peak luminosity in hours or days, a nova declines in brightness over a period of a few ________ before returning to its pre-explosion luminosity
Fill in the blank(s) with correct word
In an extrasolar planetary system containing a single planet, the parent star is measured to move about its center of mass every 24 years. Given this, what is the orbital period of the planet?
A) 48 years B) 12 years C) 24 years D) this cannot be determined from this observation
In a two-slit experiment, the third bright fringe away from the central fringe is observed at an angle of 7.0°. If the wavelength of the light is 490 nm, what is the distance between the two slits?
A) 3.6 × 10-5 m B) 4.0 × 10-6 m C) 2.1 × 10-6 m D) 2.1 × 10-5 m E) 1.2 × 10-5 m
Suppose you want to observe and study the radiation from gas inside an interstellar bubble created by a supernova. Which of the following observatories will be most useful?
A) an x-ray telescope in space B) a visible-light telescope on a mountain summit C) an infrared telescope in space D) the Hubble Space Telescope