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Gvaramadze et al. believe that the supernova progenitor was a massive, moving star, which exploded near the edge of its wind bubble and lost most of its initial mass due to common-envelope ...
- Peter Nugent
- 2017
life on Earth and supernovae, mediated by the effect of cosmic rays on ... Supernova Rates and Burial of Organic Matter, Geophysical Research Letters (2022). DOI: 10.1029/2021GL096376 3/4.
is a supernova remnant, the debris from an exploded star. It is still expanding today at more than 1000 km/s, (for more about supernova expansion see p.11) having slowed from an initial expansion speed of more than 10,000 km/s. Inside the nebula is the Crab pulsar, the compact remnant of the core of the exploded star.
- 2MB
- 8
Jun 8, 2012 · 8.1 Galactic structure and supernova rates in the Earth’s vicinity (Sections 2–5) Given the uncertainties about the Milky Way, it seemed entirely possible at the outset of the quest for local SN rates over 500 Myr that complexities of Galactic structure, dispersal of open clusters by orbital diffusion, or insufficient data would frustrate the effort.
- Henrik Svensmark
- 2012
spectra of the supernova near peak luminosity (when it’s easiest to observe), and it is: • Type I: No H-α line seen. • Type II: H-α line seen. As simple as that! But this was subsequently clarified: • Type Ia: No H-α, but Si lines seen. • Type Ib: No H-α, but He lines seen. • Type Ic: No H-α, and not much else. • Type II: H ...
Mar 7, 2019 · By Brian C. Thomas. A massive star that exploded near Earth about 2.5 million years ago—a supernova—may have helped drive the megalodon to extinction and may even have affected human evolution. Research by an international team of scientists and I have produced the most detailed picture ever of just how such a scenario played out.
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Sep 24, 2024 · The amount of cosmic radiation that Earth is exposed to varies as our Solar System moves through the galaxy. “Nearby supernova (SN) activity has the potential to raise the radiation levels at ...
