av Abigail Long för 5 årar sedan
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kepler's 2nd law- a line that connects planet's to the sun that sweeps out equal times and equal areas.
Hydrogen-a colorless, odorless, highly flammable gas, the chemical element of atomic number 1. Helium-the chemical element of atomic number 2, an inert gas which is the lightest member of the noble gas series.
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Radiation cooled the microwaves because the universe expanded, static because there was so much energy released, and leftover radiation from the big bang.