How do the sizes of planets, solar systems, galaxies, and the universe relate to one another?

Our Solar System consists of our star, the Sun, and its orbiting planets(including Earth), along with numerous moons, asteroids, comet material, rocks, and dust. Our Sun is just onestar among the hundreds of billions of stars in our Milky Way Galaxy. ... Theuniverse is all of the galaxies – billions of them!

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the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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