Astronomy

As of recent astronomical data, the total number of known moons in the Solar System exceeds 400, with discoveries continuing as technology improves. Therefore, the correct answer is 'More than 400'.

The Milky Way Galaxy is classified as a spiral galaxy because it has a flat, rotating disk with spiral arms extending outward, which is characteristic of spiral galaxies.

Pluto takes approximately 248 Earth years to complete one orbit around the Sun, which is why option B is correct. The other options correspond to orbital periods of different planets or are incorrect.

The Sun is classified as a G-type main-sequence star (G dwarf), often called a yellow dwarf, not a 'yellow draft' or any of the other options. Since none of the given options correctly name the Sun's classification, 'None of above' is the correct choice.

Pallas, Vesta, and Davida are all well-known asteroids located in the asteroid belt between Mars and Jupiter. They are not stars or comets, so the correct category is asteroids.

The Moon's regolith contains abundant quantities of helium-3, which is considered a potential fuel for future nuclear fusion energy. Earth and Venus have negligible helium-3, and while Saturn has helium, it is not accessible or abundant in a usable form for energy extraction.

Saturn currently has 82 confirmed moons, making option D the correct answer. This count is based on recent astronomical discoveries and observations.

Ceres was the first asteroid discovered in 1801 and is also the largest asteroid in the asteroid belt, making it the correct answer.

Saturn currently has 82 confirmed moons, making option D the correct answer. This is based on the latest astronomical data as of 2024.

Uranus was the first planet discovered using a telescope by William Herschel in 1781. The other planets (Jupiter, Venus, Mercury) were known since ancient times and visible to the naked eye.