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WATCH LIVE THURSDAY: Partial Solar Eclipse Webcast by Slooh

Partial Solar Eclipse Seen in Brisbane, Australia, April 29, 201
Astrophotographer CJ Armitage of Brisbane, Australia, caught the partial solar eclipse at sunset on April 29, 2014.
CREDIT: CJ Armitage

Experts with the Slooh Community Observatory will host a live webcast of the partial solar eclipse set to occur on Oct. 23. FULL STORYPartial Solar Eclipse to Darken US Skies This Week You can watch the eclipse webcast starting at 5 p.m. EDT (2100 GMT) directly through Slooh, or you can see it live in the window below:

Webcast REPLAYS

Comet Siding Spring's Flyby of Mars Webcasts

(UPDATE: The first Slooh webcast has ended. The next event will begin at 8:30 pm ET.)The Slooh Community Observatory will broadcast a double feature about Comet Siding Spring's close pass by Mars today (Oct. 19). The first Slooh webcast will start at 2:15 p.m. EDT (1815 GMT), and the second will begin at 8:30 p.m. EDT (0030 Oct. 20 GMT). Full Story: Comet Buzzes Mars in Once-in-a-Lifetime Flyby . You can watch the webcasts live in the window below:

Comet Siding Spring is due to make a close pass with the Red Planet, flying only 87,000 miles (139,500 kilometers) from Mars. Officials monitoring spacecraft orbiting Mars are maneuvering them into safe positions so that they will not experience any ill affects from the icy wanderer's dust.

The Virtual Telescope Project will also host a webcast on Oct. 19 starting at 12:45 p.m. EDT (1645 GMT). You can watch the webcast here: http://www.virtualtelescope.eu/webtv/ A window of the webcast will appear below before the start time as well.

Related Links: 

Comet Quiz: Test Your Cosmic Knowledge

Mars-Bound Comet: Photos of Comet C/2013 A1 Siding Spring (Gallery )

Mars-Bound Comet Sprouts Twin Jets in Hubble Telescope Photos

Planet Definition Debate

If you're confused about what exactly a planet is, don't feel bad: Astronomers are still arguing over the term eight years after the International Astronomical Union (IAU) came up with a controversial new definition that demoted Pluto to "dwarf planet" status.

The Harvard-Smithsonian Center for Astrophysics (CfA) is putting on an event tonight (Sept. 18) at 7:30 p.m. EDT (2330 GMT) that could help crystallize your views. The event, which will be webcast live in the window below, is called "What Is a Planet?" and features three different experts presenting their viewpoints on the term, and on the ongoing debate.

Photos of Pluto and Its Moons

Pluto: A Dwarf Planet Oddity (Infographic)

Our Solar System: A Photo Tour of the Planets

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