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Although the lunar month has a mean period of 29 days 12 hours and 44 minutes, the actual length varies throughout the year. Lengths of lunar months in 2016.
They’re calling it a Manx comet, after the cats with no tails. It may have formed in the inner solar system and been ejected outward.
A month by month listing of major moon phases, conjunctions, oppositions, meteor showers and other important dates, from astronomer Fred Espenak.
Breakthrough Starshot seeks proof of concept for a 100-million-mile-per-hour mission – using light-propelled nanocrafts – to reach the nearest star in 20 years.
Read about star travel via conventional propulsion, warp drives, and more.
Visualize a vast reservoir of icy comets on the outskirts of our solar system. That’s what Jan Oort did in 1950, and why the Oort Cloud bears his name.
Red rainbows happen when the sun is on the horizon. They’re created in much the same process that causes a sunset or sunrise to look red.
This Hubble Space Telescope image reveals the first moon ever discovered around little Makemake, in the outermost region of our solar system.
Results from the Venus Express spacecraft, obtained when – in the craft’s final months – it surfed the dense atmosphere of Venus.
Iron-60 found in moon rocks supports an earlier finding that – 2 million years ago – a supernova exploded only 300 light-years away.
Iridescent cloud over Kentucky
Altair your guide to small constellations