The planet(s) of our solar system that are never visible to the naked eye are
a. Pluto.
b. Mercury, Neptune, and Pluto.
c. Saturn, Uranus, Neptune, and Pluto.
d. Neptune and Pluto.
e. Mercury and Venus.
Question 2
______________ is the point in Earth's orbit where Earth is closest to the sun.
a. Aphelion
b. Perihelion
c. Precession
d. The winter solstice
e. a and d