The national Air and space Museum celebrates the nation's achievements in flight and space exploration, from the Wright brother's first biplane to the Apollo moon mission and beyond.
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在一项新研究中,研究人员认为,如果我们所处的宇宙有着同胞兄弟,我们可能会撞上它们。
In a new study, researchers suggest that if our universe has siblings, we may have bumped into them.
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反物质是组成宇宙中的星系、恒星和我们人类原材料(即指物质)的古怪堂兄弟。
Antimatter is a strange cousin to the stuff that makes up galaxies, stars and us.