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Hubble’s Contentious Constant Poster
Universe
Sep 20, 2017
There are two leading ways to measure the universe's rate of expansion, and for fifteen years, they more or less agreed with one another. Not anymore, and that’s a big deal.
Solar System
Sep 17, 2014
Mark your calendar: On Oct. 8th, the Moon will pass through the shadow of Earth for a total lunar eclipse. Sky watchers in the USA will see the Moon turn a beautiful shade of celestial red and maybe turquoise, too.
ScienceCasts: A Colorful Lunar Eclipse
Sep 10, 2014
Sept. 10, 2014:  Fire is inanimate, yet anyone staring into a flame could be excused for thinking otherwise: Fire dances and swirls.  It reproduces, consumes matter, and produces waste. It adapts to its environment. It needs oxygen to survive. In short, fire is... Read More
ISS
Sep 9, 2014
Astronauts onboard the International Space Station report seeing flames that behave like jellyfish. Video of the microgravity phenomenon is a must-see.
ScienceCasts: Jellyfish Flame on the International Space Station
Universe
Sep 5, 2014
Sept. 5, 2014:  A NASA instrument aboard the European Space Agency’s (ESA's) Rosetta orbiter has successfully made its first delivery of science data from comet 67P/Churyumov-Gerasimenko.
Earth
Sep 5, 2014
Sept. 5, 2014: A small asteroid, designated 2014 RC, will safely pass very close to Earth on Sunday, Sept. 7, 2014.  At the time of closest approach, based on current calculations to be about 2:18 p.m. EDT (11:18 a.m. PDT / 18:18 UTC), the asteroid will be roughly over New Zealand.  From... Read More
Earth
Sep 5, 2014
Sept. 5, 2014:  High above Earth, more than 20 miles above sea level, a diaphanous layer of ozone surrounds our planet, absorbing energetic UV rays from the sun.  It is, essentially, sunscreen for planet Earth. Without the ozone layer, we would be bathed in dangerous... Read More
Earth
Sep 4, 2014
Almost 30 years after the Montreal Protocol put the brakes on ozone-depleting chemicals, one compound remains stubbornly and mysteriously abundant in the atmosphere. NASA scientists are tracking down the source and studying its effect on the ozone layer.
ScienceCasts: Mystery in the Ozone Layer
Universe
Aug 26, 2014
August 26, 2014:  The European Space Agency's Rosetta mission has chosen five candidate landing sites on comet 67P/Churyumov-Gerasimenko for its Philae lander. Philae's descent to the comet's nucleus, scheduled for this November, will be the first such landing ever attempted.
5 of the potential landing spots for Rosetta's Philae lander
Universe
Aug 26, 2014
August 26, 2014:  Once every 50 years, more or less, a massive star explodes somewhere in the Milky Way.  The resulting blast is terrifyingly powerful, pumping out more energy in a split second than the sun emits in a million years.  At its peak, a supernova can outshine... Read More
Universe
Aug 25, 2014
A NASA sounding rocket has confirmed that the solar system is inside an ancient supernova remnant. Life on Earth survived despite the nearby blasts.
ScienceCasts: Evidence for Supernovas Near Earth
Solar System
Aug 25, 2014
August 25, 2014:  NASA’s Pluto-bound New Horizons spacecraft has traversed the orbit of Neptune. This is its last major crossing en route to becoming the first probe to make a close encounter with distant Pluto on July 14, 2015.
Universe
Aug 18, 2014
August 18, 2014:  Barely 30 years ago, the only planets astronomers had found were located right here in our own solar system.  The Milky Way is chock-full of stars, millions of them similar to our own sun.  Yet the tally of known worlds in other star systems was exactly zero. What... Read More
Universe
Aug 18, 2014
Astronomers are not only discovering planets around distant suns, they are also starting to measure those worlds with astonishing precision. The diameter of a super-Earth named Kepler 93B is now known to within an accuracy of 148 miles.
ScienceCasts: Sizing up an Exoplanet
Universe
Aug 15, 2014
Wake up early in mid-August to see Venus and Jupiter shining side-by-side.
ScienceCasts: Beautiful Conjunction