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Wednesday, December 19, 2018

Dec 19 - 1st Image from Inside Sun's Atmosphere

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Parker Solar Probe acquired this image - 1st-ever taken from inside the sun's outer atmosphere, or corona - on December 8. The bright streak is a coronal streamer. The bright object near the center is the sun's innermost planet Mercury. The dark spots are a result of background correction. Image via NASA/Naval Research Laboratory/Parker Solar Probe.
1st image from inside sun's atmosphere
NASA's Parker Solar Probe has now swept within the sun's corona. No other spacecraft has ever come this close to the sun's surface! And, it's going to get closer. Read more.
Comet gives birth to a baby bow shock
And a spacecraft sees it happen! Rosetta spacecraft data reveal an infant bow shock - similar to what forms at the bow of a ship - at the comet this craft explored for 2 years. It's the 1st seen forming anywhere in our solar system. Read more.
December solstice starts shortest season
Shortest season - between the December solstice and March equinox - is about 89 days. Longest season - June solstice to September equinox - is about 94 days. Read more.
Did a supernova kill off the megalodon?
A new study suggests that a tsunami of cosmic energy from a supernova killed off large ocean animals - including the huge megalodon shark - 2.6 million years ago. Read more.

A shower of particles might have spelled doom for the megalodon. Image via University of Kansas

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Don't miss the Jupiter-Mercury conjunction
You need an alarm clock and a clear sky to the east, the sunrise direction. Binoculars might come in handy. The 2 bright planets will come closer and closer, finally closest on December 21. Beautiful! More charts here.
See it! Jupiter and Mercury close
Jose Lagos in Maastricht, Netherlands, caught Venus (top, far right), Mercury (towards horizon) and Jupiter (just rising over horizon) yesterday morning. "Beautiful way to start the day!" he wrote. More photos here from the EarthSky community.
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