Kepler's dated observation became part of the record of the last supernova known to have been visible in our Milky Way.
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Tycho observes a new star 11 November 1572
Tycho Brahe saw a brilliant new object in Cassiopeia; it was later identified as the supernova SN 1572.
Cassiopeia gains an unexpected light 11 November 1572
The bright star-like object stood in a familiar constellation, challenging beliefs that the distant heavens never changed.
The 1572 supernova enters observing records 11 November 1572
Tycho's subsequent careful measurements tracked the object's position and brightness; the first sighting was on this date.
A stellar explosion challenges the unchanging sky 11 November 1572
The appearance of SN 1572 opened new arguments about celestial change; its physical interpretation came centuries later.
Kepler observes a supernova 17 October 1604
Johannes Kepler observed the bright new star of 1604 in the constellation Ophiuchus.
👉 A new star appears in Ophiuchus Current 17 October 1604
Kepler's dated observation became part of the record of the last supernova known to have been visible in our Milky Way.
Telescope-free astronomy records SN 1604 17 October 1604
Observers could see this extraordinary object without a telescope; the remnant remains a subject of study.
A changing sky confronts older cosmology 17 October 1604
The 1604 outburst furnished another striking challenge to the doctrine of immutable heavens.
Galileo notes three lights beside Jupiter 7 January 1610
He recorded three small points near Jupiter, initially regarding them as background stars.
Jupiter becomes a telescopic puzzle 7 January 1610
The positions of the lights were unusual enough to prompt repeated observations on later nights.
Galileo's observing notes mark a turning point 7 January 1610
His first dated observations began the sequence that established satellites orbiting Jupiter.