Question

_______ and ______are the only planets without moons.
a.)Mercury, venus
b.)Mars,venus
c.)Jupiter,Saturn
d.)Earth, mercury

Answer 1

Hint: The planet which is so close to the sun and its gravity cannot hold its own moon. If the planet has a moon then that moon can crash into the planet or maybe that moon can go into orbit around the sun. So find the planet which is closest to the Sun.

Complete step by step answer:
What is the moon?
Moon is the natural satellite of a planet, visible by reflected light from the sun.
List of planet which has moons -

From the above table, it is clear that mercury and Venus are the only planets without moons. Rest of the planets have one or more than one moons.
Mercury and Venus are so close to the sun and its gravity, so mercury cannot hold its own moon. If mercury has a moon then that moon can crash into mercury or maybe that moon can go into orbit around the sun.

Additional Information:
Earth has one moon, and its moon is the largest moon in the solar system. The Moon of Earth is the fifth largest satellite in the universe.

Note: Earth has just one moon but some planets have dozens of moons and some planets have no moons. Students should learn which planets have how many moons.