Betelgeuse has always excited my imagination. I thought it had already exploded and clumps of its matter were drifting through space. But it turns out Betelgeuse simply has a blue companion that can affect the six-year cycle of brightness changes of the red star. The companion star was first...
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The photograph (taken with the LASCO telescopes on May 24, 2025) shows a spectacular coronal mass ejection, or prominence, that looks like a bird flying away from the Sun. The bird is 10 times larger than Earth. It is relatively cold solar material ejected into the magnetosphere of our star and...
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On March 29, a solar eclipse will be visible in Ukraine from 10:50 a.m. to 2:43 p.m. Kyiv time. The war is unlikely to end after this, but it will be interesting to watch the astronomical phenomenon....
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Many astronomers are currently watching the constellation Corona Borealis (CrB) for the long-awaited outburst of the repeating variable star T CrB. When that happens (possibly in the next few weeks), "T Cor Bor" is expected to brighten dramatically, a couple thousand times in a matter of...
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Stars are giant balls of hot gas composed mainly of hydrogen and helium. And why are they hot and bright? Thanks to nuclear fusion, temperature, pressure and mass are all in a delicate balance up to a certain point. 99% of the mass of our solar system is the Sun. It is not for nothing that our Star...
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