What Do You Know About Astronomy ?

Pluto is considered a dwarf planet because it does not meet all the criteria to be classified as a full planet. In 2006, the International Astronomical Union redefined the definition of a planet, and Pluto did not meet the requirements. It is smaller than the eight planets in our solar system and has not cleared its orbit of other debris, which is one of the criteria for being classified as a planet. Therefore, Pluto is now classified as a dwarf planet.

Uranus is the correct answer because it is one of the four gas giants in our solar system, along with Jupiter, Saturn, and Neptune, that have rings. These rings are made up of small particles of ice and rock, and although they are not as prominent or well-known as the rings of Saturn, they have been observed and studied by astronomers. Venus, Mercury, and Earth do not have rings.

Uranus is the coldest planet in our solar system. It is located farthest from the Sun, which results in extremely low temperatures. 

The term "orbit" describes the path an object takes in space as it revolves around another. In this context, it refers to the trajectory followed by celestial bodies such as planets, moons, and satellites as they move around a central object, typically due to gravitational forces. The concept of an orbit is fundamental in understanding the motion and behavior of objects in space.

Mercury is the planet closest to the sun. This is because it has the shortest distance from the sun compared to all the other planets in our solar system. Its proximity to the sun means that it experiences extremely high temperatures, making it a hot and inhospitable planet.

Saturn is the correct answer because it is the farthest planet from the sun among the given options. While Mars, Mercury, and Earth are all closer to the sun than Saturn, Saturn is located at an average distance of about 1.4 billion kilometers from the sun, making it the farthest planet in our solar system from the sun.

The Earth takes approximately 365.24 days to revolve around the Sun. This is known as a tropical year, which is the time it takes for the Earth to complete one orbit around the Sun relative to the vernal equinox. The extra 0.24 days account for the leap year, where an additional day is added to the calendar every four years to keep the calendar year synchronized with the solar year.

Saturn is the second biggest planet in our solar system after Jupiter. It is known for its iconic rings, which are made up of ice particles, dust, and rocks. Saturn has a diameter of about 120,536 kilometers, making it the second largest planet by size. It is a gas giant, composed mostly of hydrogen and helium. Saturn is famous for its beautiful and distinct ring system, which is made up of thousands of individual rings. These rings are made up of chunks of ice and rock, ranging in size from tiny grains to large boulders.

The first four planets are known as inner planets because they are located closer to the Sun compared to the outer planets. These planets, namely Mercury, Venus, Earth, and Mars, have rocky surfaces and are relatively smaller in size compared to the outer planets. They also have shorter orbital periods and are made up of heavier elements.

Comets are composed of ice and rock. As a comet approaches the Sun, the heat causes the ice to vaporize, creating a glowing coma (or atmosphere) around the solid nucleus. The coma reflects sunlight, giving the appearance of a bright, glowing object in the night sky. The nucleus is made up of rock, dust, and various organic compounds. The combination of ice and rock makes up the majority of a comet's composition.

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