Our solar system is made up of the Sun and everything that orbits around it, including eight planets, their moons, and many smaller objects like asteroids and comets. The Sun sits at the center and contains more than 99 percent of all the mass in the solar system. Its powerful 'gravity' is what keeps all the planets and other objects traveling in their paths, called 'orbits.' Without the Sun's gravity, the planets would fly off into space in straight lines.

The four planets closest to the Sun are called the 'inner planets' or 'terrestrial planets.' These are Mercury, Venus, Earth, and Mars. They are all relatively small and made of rock and metal. Mercury is the smallest planet and the closest to the Sun, with temperatures that can reach over 800 degrees Fahrenheit during the day. Venus is the hottest planet in the solar system because its thick atmosphere traps heat, even though it is farther from the Sun than Mercury. Earth is the only planet known to support life, thanks to its liquid water and protective atmosphere. Mars, often called the "Red Planet" because of its iron-rich soil, has the largest volcano in the solar system, called Olympus Mons.

Beyond Mars lies the 'asteroid belt,' a region filled with millions of rocky objects that orbit the Sun. Most asteroids are small and irregularly shaped. Past the asteroid belt are the four 'outer planets,' also known as 'gas giants' and 'ice giants.' Jupiter and Saturn are gas giants made mostly of hydrogen and helium. Jupiter is the largest planet in our solar system - more than 1,300 Earths could fit inside it. Saturn is famous for its beautiful rings, which are made of billions of pieces of ice and rock. Uranus and Neptune are called ice giants because they contain large amounts of frozen water, ammonia, and methane. Neptune, the farthest planet from the Sun, has winds that can blow faster than 1,200 miles per hour.

Each planet takes a different amount of time to complete one orbit around the Sun. Mercury, the closest planet, takes only 88 Earth days to go around the Sun, while Neptune takes about 165 Earth years to complete a single orbit. The farther a planet is from the Sun, the longer its orbit takes. This is because the Sun's gravity is weaker at greater distances, and the planet has a much longer path to travel.

Scientists continue to explore our solar system using space probes, rovers, and telescopes. NASA's Voyager 1, launched in 1977, has traveled beyond the edge of the solar system and is now in 'interstellar space' - the space between stars. Closer to home, rovers like Perseverance are exploring the surface of Mars, looking for signs that life may have once existed there. Every new discovery teaches us more about our amazing solar system and the universe beyond it.