简洁
发表于 2025-3-26 21:21:16
Working-Class Writing and ExperimentationBefore we continue, we should pause briefly to contemplate what we know about time. After all, time, like space, is also critical in our flight to the stars, so it’s essential that we understand it as fully as possible.
人类的发源
发表于 2025-3-27 05:01:12
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Vertical
发表于 2025-3-27 07:28:24
The Nature of Time and Space-time,Before we continue, we should pause briefly to contemplate what we know about time. After all, time, like space, is also critical in our flight to the stars, so it’s essential that we understand it as fully as possible.
官僚统治
发表于 2025-3-27 12:18:25
Working-Class Writing and Experimentationat would it feel like to be suddenly catapulted hundreds, even thousands of years into the future? What would it be like to visit your ancestors? Science fiction writers have been speculating on such matters for years. But will it ever become reality? Scientists have recently been looking into this
创作
发表于 2025-3-27 16:48:56
f Pluto. But, as he pushes farther into space, the challenges and obstacles mount. It took Apollo only three days to reach the moon, but Pioneer 10 took nearly two years to reach Jupiter, and it was 14 years before it finally exited the solar system. At this speed it would take 80,000 years for us t
浮雕
发表于 2025-3-27 18:16:07
Working-Class Writing and Experimentation One of the major reasons we want to understand space is because we would like to travel between two points in the universe without actually traversing the space between them. Impossible, you say. Yes, it does sound impossible, but we will see in this chapter that we might eventually be able to do i
PAN
发表于 2025-3-28 00:30:31
Working-Class Writing and Experimentationature become? Is it possible for matter to create an infinite curvature? This possibility bothered Einstein and others after the first solution of the field equations of general relativity was found. Indeed, a mystery developed that was not cleared up for over 40 years. It was, however, the final re
defray
发表于 2025-3-28 04:51:57
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expository
发表于 2025-3-28 08:46:53
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Brain-Waves
发表于 2025-3-28 12:28:19
Working-Class Writing and Experimentation go about getting observational evidence? It obviously isn’t easy. Black holes are only a few miles across and emit no light. Furthermore, they are black, the same color as the background sky. If we were close enough to one, we would be able to detect it indirectly, since it would block off the ligh