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Dark nebulae are star-obscuring clouds of gas and dust
Dark nebulae are clouds of gas and dust in space. They block the light of stars shining behind them. Often, they're locations where new stars are forming. The post Dark nebulae are star-obscuring clouds of gas and dust first appeared on EarthSky .
Halloween is an astronomy holiday. It’s a cross-quarter day
A cross-quarter day falls between an equinox and a solstice. Halloween is the year's 4th cross-quarter day and the spookiest of them all. The post Halloween is an astronomy holiday. It’s a cross-quarter day first appeared on EarthSky .