Question

The moon revolves around the Earth in _________
A. 30 days
B. 25 days
C. 27 days
D. 29 days

Answer 1

Hint: The Moon is a round cosmological body of terrestrial mass that orbits Earth, the 3rd planet in the Solar System, as the planet's only natural satellite. The Moon, which is of a gravelly silicate configuration, is without a substantial atmosphere, hydrosphere, or magnetic field.

Complete answer:
The Moon's rotation on its own axis is tidally sealed to Earth, so the same side constantly faces the planet: its near side. Due to libration, a little more than half (about 59 percent) of the total lunar exterior can be seen. A full orbit of the Moon all around Earth takes about $27.3$ Earth days (a sidereal month); a synodic month ($29.5$ days) synchronizes with the lunar stages detected from Earth, and marks in the lunar month of a lunar calendar. The near side of the Moon is manifested by dark volcanic maria ("seas"), which permeate the spaces between cheerful primeval crustal highlands and effect craters. The lunar exterior is quite overcast, with a reflection factor just a little brighter than that of dilapidated asphalt, and yet the Moon is still the second-brightest otherworldly entity habitually noticeable in Earth's sky after the Sun as it mirrors mostly direct sunlight, is juxtaposed by the fairly dark sky and has a huge ostensible size observed from Earth. The ostensible size in Earth's sky is almost the same as that of the Sun, letting the Moon cover the Sun almost entirely during a total solar eclipse.

Thus, option (C) is correct.

Note: Humans have remained for some days on the Moon. One specific task for astronauts' daily life throughout their stay on the exterior is the lunar dust attaching to their suits and being passed into their accommodations. Afterward, the dust was tasted and smelled by the astronauts, calling it the "Apollo aroma". This adulteration poses a hazard since the fine lunar dust can initiate health issues. In 2019, at least one plant seed grew in experimentation, carried along with other small life from Earth on the Chang'e 4 lander in its Lunar Micro Ecosystem.