Are planets in the solar system that are closer to the Sun older than the ones further away? – Gavriel, age 10, Paducah, Kentucky A cloud of collapsing gas created our Sun, the first thing to form in ...
Green Matters on MSN
Experts are finally getting a look at how the universe builds its most common planets
A four-planet system reveals remarkable insights about how planets form and how they change during their lifetime.
Pluto was reclassified as a dwarf planet in 2006. Our solar system may have a ninth planet after all, researchers say. The possibility that an additional planet may be hidden far into the solar system ...
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