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Famous Wow! signal might have been from comets, not aliens


On 15 August 1977, radio astronomers using the Big Ear radio telescope at Ohio State University picked up a powerful signal from space. Some believe it was our first interception of an alien broadcast. Now it seems something closer to home may have been the source: a pair of passing comets.

The signal ? known as the ?Wow! signal? after a note scribbled by astronomer Jerry Ehman, who detected it ? came through at 1420 megahertz, corresponding to a wavelength of 21 centimetres. Searchers for extraterrestrial transmissions have long considered it an auspicious place to look, as it is one of the main frequencies at which atoms of hydrogen, the most common element in the universe, absorb and emit energy. What?s more, this frequency easily penetrates the atmosphere.

But in the 40 years since, we?ve never heard anything like it again. Analysis of the signal ruled out a satellite, and a reflected signal from the Earth?s surface is unlikely because regulations forbid transmission in that frequency range.

The signal?s intensity rose and fell over the course of 72 seconds, which is the length of time that the Big Ear could keep an object in its field of view due to the rotation of the Earth. That meant it was clearly coming from space. So what was it?

Antonio Paris, a professor of astronomy at St Petersburg College in Florida, thinks the signal might have come from one or more passing comets. He points the finger at two suspects, called 266P/Christensen and P/2008 Y2 (Gibbs). ?I came across the idea when I was in my car driving and wondered if a planetary body, moving fast enough, could be the source,? he says.
Hydrogen clouds

Comets release a lot of hydrogen as they swing around the sun. This happens because ultraviolet light breaks up their frozen water, creating a cloud of the gas extending millions of kilometres out from the comet itself.

If the comets were passing in front of the Big Ear in 1977, they would have generated an apparently short-lived signal, as the telescope (now dismantled) had a fixed field of view. Searching that same area ? as subsequent radio telescopes did ? wouldn?t show anything. Tracing the comets? positions back in time, Paris says that the possible origin for the Wow! signal falls right between where they would have been.

Neither comet was known in 1977; they were both discovered in the last decade, which would mean nobody would have thought to search for them. The odds of any telescope catching them in the region of the Wow! signal by chance were vanishingly small.

To test his idea, Paris proposes looking at the same region of space when the comets are back. Comet 266P/Christensen will transit the region first, on 25 January 2017, then P/2008 Y2 (Gibbs), on 7 January 2018. An analysis of the hydrogen signal of the comets should reveal if he is correct.
Doubts signalled

Some researchers are sceptical, saying it isn?t clear the comets would release enough hydrogen to generate something like the Wow! signal. James Bauer of the Jet Propulsion Laboratory in Pasadena, California, agrees that the hydrogen from comets can extend quite far, but still thinks the signal won?t be strong enough. ?If comets were radio-bright at 21 centimetres, I would be puzzled as to why they aren?t observed more often at those wavelengths,? he says.

Paris says future observations will determine whether he is right. One crucial piece of evidence will be how fast the comets move across the sky. Too slow, and the Big Ear would have seen another signal 24 hours later as they rolled back into view, unlike the solo blast of the Wow! signal. ?The hypothesis must be tested before it is ruled out,? he says. ?Science 101.?
 
Just saw the footage. They are getting really close to making it work.

Plus I learned that they refer to things blowing up as RUDs - Rapid Unscheduled Disassembly. That really made me chuckle.
 
they basically nailed it...to bad one of the pegs broke off, or it would've remained upright
 
Musk said it was due to ice build up, possibly due to condensation as a result of the foggy blast off. If only they had a heat source on that thing to get rid of condensation...
 
Now they're making real progress - for the first time the same reusable rocket has been launched and landed twice, this time it's Blue Origin.

 
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SpaceX internal test video leaked:


GET IT WHILE IT'S HOT (and before it's taken down).
 
Dammit can't watch until I get home. Hopefully it's still up in a couple of hours.
 
SpaceX internal test video leaked:

GET IT WHILE IT'S HOT (and before it's taken down).

I'm pretty sure all of that footage is public. Possibly with the exception of full-scale separation and full-duration static burn. But all the rest has definitely been published in multiple SpaceX videos, most of it very recent (both landings, Dragon hover and parachute tests).
 
Is it still available? I got two links for it in newsletter emails, but both links are now dead.
 
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