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Pair instability supernova: what is it?

[ad_1] Pair instability supernovae occur in massive stars with low metallicity. The core’s high energy creates electron-positron pairs, leading to a pressure drop and partial collapse. The resulting thermal energy blows the star apart completely, leaving no remnants. Eta Carinæ could potentially explode in a pair-instability supernova, visible both day and night. A pair instability […]

Au Pair vs. nanny: what’s the difference?

[ad_1] Au pairs and nannies both provide in-home childcare, but au pairs are typically young people from another country seeking cultural exchange, while nannies are often career childcare professionals. Au pairs have specific regulations and receive room and board plus a small allowance, while nannies receive a living wage. Au pairs may not speak the […]