What causes precession and why does it "move" the celestial equator among the stars?
What will be an ideal response?
Precession is caused by gravitational forces of the Moon and Sun acting on the equatorial bulge of the spinning Earth, causing the Earth's axis to sweep around in a conical motion. Because the celestial equator is defined by the Earth's equator, as the Earth precesses the celestial equator moves slowly against the background of stars.
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What do X-ray observations tell us about conditions around a potential nova?
What will be an ideal response?
The meridian at 0 degrees is:
What will be an ideal response?
Light rays from a distant source __________________, assuming the light does not pass through any cloud-like nebulae
a. are perpendicular b. focus to an image c. focus to a point d. are parallel
A perpetual motion machine of the first kind
A. violates the first law of thermodynamics B. would be a good investment C. violates the second law of thermodynamics D. violates the zeroth law of thermodynamics