Mercury is the smallest and innermost planet in the Solar System. Its orbit around the Sun takes only 87.97 days, the shortest of all the planets in the Solar System.
Neil Armstrong was an American astronaut and aeronautical engineer. He was part of the Apollo 11 crew and the first person to walk on the Moon in 1969. He was also a naval aviator, test pilot, and university professor.
Mars, known as the red planet, is the fourth planet from the Sun. It is a cold desert world with a very thin atmosphere, polar ice caps, canyons and extinct volcanoes.
Saturn is the sixth planet from the Sun and the second largest planet in our solar system. The planet is a gas giant and its most famous feature is its rings, composed mostly of ice particles, with a smaller amount of rocky debris and dust.
Gravity is what holds the planets in orbit around the sun and what keeps the moon in orbit around Earth. The gravitational pull of the moon pulls the seas towards it, causing the ocean tides.
Galileo was a hugely influential Italian astronomer, mathematician, physicist and philosopher. His discoveries with the telescope revolutionized astronomy.
Our Sun and all the planets around it are part of a galaxy known as the Milky Way Galaxy. A galaxy is a large group of stars, gas, and dust bound together by gravity. They come in a variety of shapes and sizes. The Milky Way is a large barred spiral galaxy.
Very hot stars look white or blue, cooler stars look red or orange. Stars are giant balls of gas. Clouds of dust and gas swirl through the universe. As more dust and gas is collected, the mass gets heavy and becomes hot. If this mass gets really big and hot, it becomes a star.