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supernova · Milky Way, historic naked-eye event

What is Tycho’s Supernova?

1572 naked-eye supernova observed by Tycho Brahe, disproving the idea of unchanging heavens.

Worth knowing about Tycho’s Supernova

Its light took about 9,000 years to get here.

Why it stands out
Tycho showed that the new “star” had no parallax, so it lay far beyond the Moon — direct evidence against unchanging heavens.
What it is
A Type Ia supernova: not a massive star collapsing, but a white dwarf that was fed too much gas by a companion and detonated. Nothing at all was left behind — no neutron star, no black hole, just the expanding wreck.
How we know: Centuries later its light was caught a second time, reflected off dust clouds to one side and arriving the long way round. Splitting that echo showed the same fingerprint modern Type Ia supernovae have.
Tycho’s Supernova — A model, seen from the Earth, with north up.
The numbers
Distance from usabout 9,000 light-years
Discovered1572

We use about 9,000 light-years, from the supernova’s light curve (Ruiz-Lapuente 2004, 2.83 ± 0.79 kiloparsecs). Published estimates run from about 5,500 to 13,000.

How anyone knows this

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