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Inertia is the tendency of a moving object to keep moving in a straight line.

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Gravity by itself would just pull the planets into the Sun. But gravity with inertia together make Earth move in a nearly circular motion called an ellipse.

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All objects have mass and all objects are pulled towards one another by gravity. However, the strength of the pull of gravity decreases when the total mass of the two objects decreases.

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Gravity is a force of attraction, or pull between any two objects.

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Mercury and Venus have no moons, Earth has one, Mars has two, and Jupiter has at least 63 moons. Saturn has 49, scientists have discovered around 27 moons around Uranus, and 13 moons orbiting Neptune. The dwarf planet Pluto, has at least 3 moons.

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Space probes have explored all 8 planets, but only Earth’s moon has been explored by humans.

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A moon is an object that circles around a planet. Planets have different numbers and sizes of moons.

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There are a few dwarf planets in our solar system. One is Pluto, UB313, or Eris, and finally Ceres, the largest object in our asteroid belt.

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Amazingly, the Sun shoots out heat and energy called, solar flares, stretch out from the corona and chromosphere. Solar flares are very dangerous, and cause power outages. They also create aurora borealis, or northern lights. That’s all for now!

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The layers of our Sun are the core, right in the middle, then the radiation layer comes, which is surrounding the core. Then there’s the convection layer, which gases with different energies move in circles in a way similar to air with different densities.

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About 71% of the Sun's mass is hydrogen, and 27% is helium. The remaining 2% is oxygen and carbon.

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The Sun is made of helium and hydrogen.