astronomy

Bob Wick, BLM

Electronic billboards are restricted in most of Arizona to protect dark skies for astronomers. Now lawmakers have lifted the ban in a region of Mohave County. KNAU’s Melissa Sevigny reports.


Molly Baker

A decade ago Flagstaff suffered a blow when Pluto was “demoted” to a dwarf planet. It was discovered at Lowell Observatory in Flagstaff in 1930 and is a source of pride for the city. But astronomers voted on the definition of a planet and Pluto didn’t make the cut. Now, planetary scientists say that definition is both overly complicated and incomplete.  They’ve suggested a different one. Melissa Sevigny from the Arizona Science Desk spoke with two Lowell scientists about the definition, Will Grundy and Gerard van Belle.   


Caltech/R.Hunt(IPAC)

The public can now join the hunt for the elusive Planet Nine, a massive planet astronomers believe might be hidden beyond Neptune.

NASA

Six months from today a total solar eclipse will cross the nation from coast to coast. The last time that happened was nearly a century ago. From the Arizona Science Desk, Melissa Sevigny reports on how Arizona astronomers are gearing up for the “Great American Eclipse.”


NASA Goddard Space Flight Center Scientific Visualization Studio

The full moon will appear a bit dimmer as it rises tonight (Friday, February 10). That’s because it’s due for a special kind of lunar eclipse.


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