Why can't a lunar eclipse happen at every full moon?
What will be an ideal response?
Most full moons pass too far north or too far south of the ecliptic and miss the umbra of Earth's shadow, only when the full moon passes at a node can it be eclipsed.
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Kepler's three laws of planetary motion were useful but not considered fully explained until
A. Galileo developed the telescope for astronomical observation. B. Pythagoras developed his famous theorem about right triangles and the Golden Ratio. C. Vivaldi composed his astronomical concerto, "The Four Seasons." D. Newton introduced the law of universal gravitation for astronomical and terrestrial objects.
Energy is released during a nuclear reaction due to a conversion between mass and energy. Mass is not conserved. The initial and final amounts are different. If a total of 1.0 gram of mass is "missing", how much energy has been released?
a. 9.0 × 10^11 J b. 9.0 × 10^17 J c. 9.0 × 10^15 J d. 9.0 × 10^13 J e. 9.0 × 10^16 J
The bright object in this photo is a quasar (named 3C 273). According to current understanding, about how big is the source of the bright light?
A) about the size of our solar system B) about a million light-years across C) about the size of the central bulge of the Milky Way Galaxy (that is, about 10,000 light-years across) D) about 500 light-years across
At the Sun Dagger in New Mexico, a dagger-shaped beam of sunlight pierces a spiral
A) every day at noon. B) at noon on the summer solstice. C) at sunset on the spring equinox. D) at noon on the day of full Moon each month. E) during the totality of a total solar eclipse.