The planetary nebula NGC 1514 and its binary central star, the orbital period of which was found to be more than nine years
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H II regions are clouds of glowing, ionised gas associated with regions of recent star formation. By studying the light emitted by these regions, we can learn about their physical conditions and chemical composition, providing important clues about how stars and galaxies form and evolve. One of the key properties we need to know is the temperature of the gas. We can measure it from the emission lines of different chemical elements, which probe different parts of an H II region. However, it is not always possible to measure all these temperatures directly. In these cases, we need to estimateAdvertised on -
Only a handful of observations truly constrain the nature of dark matter, which is why dozens of different physical models are still viable. Several of the most popular alternatives predict that dark matter halos slowly “thermalize” over time, gradually changing shape and expanding until they form a central region of nearly constant density -- a core. This transformation would not occur if the dark matter particles were completely collision-less, as assumed in the standard model. Therefore, the presence or absence of such a core provides a powerful way to distinguish between the standardAdvertised on -
SN 2021lwz: Understanding an Unusual Stellar Explosion Discovery and Initial Mystery On May 10, 2021, astronomers detected a supernova called SN 2021lwz at a distance of approximately 900 million light-years from Earth. What made this event remarkable was its unusual behavior: it combined characteristics of different supernova types in ways that didn't fit established classifications, prompting an in-depth investigation. Why This Supernova Matters Supernovae are among the most energetic events in the universe, marking the violent deaths of massive stars. They help astronomers understandAdvertised on