The Sound of the Big Bang Might Be Telling Us Our Galaxy Lives in a Billion-Light-Year-Wide Cosmic Hole Controversial model posits Earth and our galaxy may reside in a supervoid.

In nuclear physics, "magic numbers" identify specific numbers of protons or neutrons that lead to especially stable nuclei.

Well, it's July 12, which means (a) the Steam Summer Sale is over and (b) it's really hot outside in the northeastern U.S.

Check out our RKT stock chart to see a history of performance, current stock value, and a timeline of financial events & indicators for a full analysis today.

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At Yahoo Finance, you get free stock quotes, up-to-date news, portfolio management resources, international market data, social interaction and mortgage rates that help you manage your financial life.

At Yahoo Finance, you get free stock quotes, up-to-date news, portfolio management resources, international market data, social interaction and mortgage rates that help you manage your financial life.