Why do the patterns of the stars in our sky look the same from year to year?
A) because the stars in the constellations move so slowly-typically about the speed of a snail-that their motions are not noticeable
B) because the stars in the constellations are so far away
C) because the stars in the constellations are not moving
D) because the stars in the constellations all move at the same speeds and in the same directions, so they don't change their relative positions
Question 2
Each of the following lists two facts. Which pair of facts can be used with Newton's version of Kepler's third law to determine the mass of the Sun?
A) Mercury is 0.387 AU from the Sun and Earth is 1 AU from the Sun.
B) Earth rotates in one day and orbits the Sun in one year.
C) The mass of Earth is 6 1024 kg and Earth orbits the Sun in one year.
D) Earth is 150 million km from the Sun and orbits the Sun in one year.
The "Emu in the sky," a constellation defined by dark clouds rather than the stars.
The Pleiades, an open cluster of stars in the constellation of Taurus.
Why Different Constellations Are Visible at Different Times of the Year
Patterns of fever
Patterns of Ethnicity