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In one way of naming stars, a(n) ____ letter indicates its brightness relative to the other stars in the constellation.

Halley’s comet has an orbital period of 76 years, what is the average distance of Comet Halley from the Sun?

At what wavelength would a star radiate the greatest amount of energy if the star has a surface temperature of 60,000 K?

Kepler’s second law implies that

The Doppler effect states that the motion of any object can

The seasons are caused by the precession of Earth’s axis.

Most star names, such as Aldebaran and Betelgeuse, are___ in origin.

The ____ of a gas is a measure of the average speed of the particles (atoms or molecules) in the gas.

You and your friend put the palms of your hands together and push equally on each other so your hands don’t move. Which law(s) does this follow? Choose the best answer. I. Newton’s first II. Newton’s second III. Newton’s third IV. Newton’s law of gravitation  

The celestial equator always crosses the horizon at the east point and west point.