时间旅行在理论上是可以实现的。爱因斯坦创立的相对论将空间和时间联系在了一起，相对论提出，如果你以接近光速的速度从地球向太空飞去，那么在返回地球时，你将可以到达 “未来”。然而，要想 “穿越” 到过去则困难得多，不过理论上是有一种方法 ...

The Shenzhou-23 crew aboard China's Tiangong space station sent heartfelt Mid-Autumn Festival greetings via a video from 400 km above Earth on Friday. This is the fourth Mid-Autumn Festival since the ...

Here’s what you’ll learn in this story: Time might actually have 3 dimensions. But it also means that the space would actually be one-dimensional, instead of the three dimensions we’re familiar with.

What is space-time? Depending on how fast you're moving or how close you are to Earth's gravity can change the way time feels. Einstein’s theory of general relativity views time similarly to width, ...

What time is the SpaceX Falcon 9 rocket launch in Cape Canaveral, Florida? Pending weather and clouds, liftoff may be seen ...

Matter tells space how to curve, and curved space tells matter how to move. That's the basic principle behind Einstein's General Relativity, which linked, for the first time, the phenomenon of gravity ...

The “gravitational memory effect” predicts that a passing gravitational wave should forever alter the structure of space-time. Physicists have linked the phenomenon to fundamental cosmic symmetries ...

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Aug. 31, 2026 NASA’s Roman Space Telescope has launched on a million mile journey to L2, where it will scan huge portions of the cosmos for clues about dark matter, dark energy, and distant worlds.