For measuring the distances to galaxies within 17 Mpc, we rely primarily on ________ variable stars
Fill in the blank(s) with correct word
Cepheid
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The main form of radiation that our bodies emit is __________
Fill in the blank(s) with correct word
Over the course of a single night, stars move overhead due to ________.
A. the motion of the Sun around the galaxy B. their motion around Earth C. the tilt of Earth's axis D. the rotation of the celestial sphere E. the rotation of Earth on its axis
If I weigh 741 N on Earth at a place where g = 9.80 m/s2 and 5320 N on the surface of another planet, what is the acceleration of objects due to the gravitational attraction on that planet?
A) 70.4 m/s2 B) 51.4 m/s2 C) 61.2 m/s2 D) 81.0 m/s2
Which of the following stars is a part of the Solar System?
A) The Sun B) Proxima Centauri C) Sirius D) The Pistol Star