Sirius, the brightest star in the sky, is 8.7 ly from the Sun. Determine Sirius' declination and right ascension
Declination: 16° 39'; right ascension: 6 h 43 min as found on the celestial sphere.
The distance that the star is from the Sun does not affect this answer.
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What spacecraft was intentionally destroyed in 2003 so that it could not hit Europa?
A) Cassini B) Voyager 2 C) Galileo D) Huygens E) Pioneer 11
Tectonic plates are composed of the
A) crust and mantle. B) lithosphere. C) lithosphere and the asthenosphere. D) crust.
A particle of charge +2q is placed at the origin and particle of charge -q is placed on the x-axis at x = 2a. Where on the x-axis can a third positive charge be placed so that the net electric force exerted on it is zero?
A) 3.4a B) 6.8a C) 8.6a D) 9.3a E) 1.0a
The top of the troposphere is called the
a. stratopause. b. tropopause. c. mesopause. d. thermopause.