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	in As-it-happens update ⋅ 13 January 2019
	WEB
	APOD: 2019 January 13 - Tychos Supernova Remnant in Xray Apod - NASA Finding progenitor remnants of Tycho's supernova is particularly important because the supernova is of Type Ia, an important rung in the distance ... Flag as irrelevant

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