The world's tallest artificial Christmas tree measured a mammoth 5.20 x 103 cm. How tall is the tree in kilometers?

answer

fusion: the energy source of stars. the energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. when the core is hot enough, nuclear fusion commences. fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

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air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

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