EarthSky News - Nov 18 - Top Stories This Week

November 18 Top Stories This Week by:

Scientists warn: Soon it will be too late to save Earth More than 15,000 scientists in 184 countries have signed a letter urging the world to address major environmental concerns. Photos of this week's spectacular dawn Photos from around the globe of Venus, Jupiter, Mars and the moon, which put on a show at dawn this week.  When mammals switched from nights to days A new study suggests mammals became active in daylight after the dinosaurs went extinct. 5 discoveries we owe to twins Twin research has led to insights into how our genes and the environment affect our health.  Scientists find teeth of early human ancestor Fossil teeth from tiny, furry-tailed creatures - thought by scientists to be a human ancestor - dating back 145 million years. November is the month of the Pleiades It's when this star cluster - aka the Seven Sisters - shines from dusk until dawn. How to see it. Tonight … Peer out our galaxy's south window Visualize looking away from our Milky Way galaxy's flat star-rich disk, into intergalactic space.

Keep up with all phases of the moon every night of the year! We sold out of these calendars quickly last year. Get yours now! P.S. They make great holiday gifts.

Morning triangle over Valletta Lighthouse The moon, Jupiter (top) and Venus make a triangle early in the morning of November 17, 2017 over Valletta Lighthouse. Photo taken from Tigné Point on the island of Malta, by Gilbert Vancell Nature Photography. More photos of this week's spectacular dawn here.

Tonight … Peer out our galaxy's south window When you look in this direction, you're looking away from the flat plane of our Milky Way – where most of our galaxy's stars reside – and toward intergalactic space Submit your photo to EarthSky here!

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