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Additional info for My First Britannica Volume 02 - Physical Sciences and Technology
We can’t see gravity or touch it. We can only feel it. The Earth has gravity that pulls down on everything on or near it. It is this force that keeps us all on Earth. The Moon and the Sun also have gravity. All bodies in the universe have gravity. In fact, gravity helps hold all of them together. Sir Isaac Newton first introduced the idea of gravity, and Albert Einstein added to Newton’s ideas. Gravity works in a two-way system. This means that all bodies have a pull on each other. For example, Earth’s gravity forces the Moon to circle around it all the time.
This “solar energy” is used to heat houses, water, escapes, it gives and, in some countries, ovens used a mighty push. This push is so strong for cooking. Solar power can even that it was used to be converted to electricity and move the early stored for later use. _______ engines. To human beings the second most important source of thermal energy is the store of natural fuels on and in the Earth. When these fuels—mainly coal, oil, gas, and wood—are burned, they produce heat. This heat can be used for warmth, made to power a machine directly, or converted into electricity.
This means its day is about two-thirds as long as ours. But it has a much longer year. There are about 60,225 days in one Neptune year. That’s how many days it takes the planet to orbit the Sun. It has been in the same year since its discovery in 1846. Each season on Neptune lasts for 41 Earth years. Like Saturn, Neptune has rings, but they aren’t as noticeable. RCH LI Neptune also has 13 known moons. Triton is the largest moon. Triton is slowly drawing closer to Neptune. It is believed that it will someday crash into the planet.
My First Britannica Volume 02 - Physical Sciences and Technology by Encyclop?dia Britannica, Inc.