Question

what is the number of major planets of the solar system?
A. 7
B. 8
C. 9
D. 12

Answer 1

Hint - Solar System is the system bound to the gravitational Sun and the objects that orbit it, either directly or indirectly. The objects that directly orbit the Sun are the largest eight planets, with the remaining smaller objects, dwarf planets, and smaller solar system bodies. Of the objects orbiting the Sun indirectly - natural satellites - the smallest planet is larger than Mercury.

Complete answer:
The solar system was formed 4.6 billion years ago by the gravitational collapse of a massive interstellar molecular cloud. The four smaller inner planets, Mercury, Venus, Earth, and Mars, are terrestrial planets, which are mainly composed of rock and metal. The four outer planets are giant planets, which are much more massive than terrestrial. The two largest planets, Jupiter and Saturn, are giants of gas primarily composed of hydrogen and helium; The two outermost planets, Uranus and Neptune, are giants of ice, being formed from relatively high melting points along with hydrogen and helium, called volatiles such as water, ammonia, and methane. All the eight planets have a nearly circular orbit, which lies within an almost flat disk, called an elliptical. The solar system also contains small objects. Beyond the orbit of Neptune is the Cooper belt and scattered disks, which are populations of trans-Neptunian objects composed mostly of ions, and a new discovery is made beyond them. Within these populations, some objects are large enough to be rounded under their own gravity, although there is considerable debate as to how many will be proven. Such objects are classified as dwarf planets. Six of the planets, the six largest possible dwarf planets, and many smaller bodies are orbited by natural satellites, usually called the "moon" after the moon.

So option B is the correct answer.

Note - A stream of the solar wind, charged particles is flowing outward from the Sun, creating a bubble-like interstellar medium known as the interstellar medium. Heliopauss points from the solar wind in which the pressure is equal to the opposing pressure of the interstellar medium; It extends to the edge of the scattered disk. Oort clouds, for which long-term comets are thought to be the source, may also be present at distances about one thousand times further than the heliosphere. The solar system is located in the Orion Arm, which is 26,000 light-years from the center of the Milky Way galaxy.