At the high temperatures achieved in the very young Universe, not only can particles and photons be spontaneously created, given enough…
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As long as there are still interactions occurring between objects in space, including gravitational collapse, nuclear transitions, stellar cataclysms, and anything…
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At the start of the hot Big Bang, the Universe was rapidly expanding and filled with high-energy, very densely packed, ultra-relativistic…
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Carl Sagan was one of the most prominent scientific figures of the 20th century, helping cofound the now-thriving field of planetary…
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This image shows the Pillars of Creation within the Eagle Nebula, as assembled by two entirely different data sets. On the…
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Many collaborations have used JWST to take deep-field images: some wider and some deeper than others. Here’s how it can surpass…
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At the upper limits of what’s energetically possible, cosmic rays still persist. What happens if a human gets hit by the…
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Our great hope is that today’s indirect, astrophysical evidence will someday lead to successful direct detection. What if that’s… Continue reading…
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Outer space begins just over 100 kilometers up, but what we can see extends for billions of light-years. Here’s what all…
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Even in an expanding Universe, we expect both redshifted and blueshifted galaxies. But nearly every one we see is redshifted. Here’s…