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On ‎12‎/‎26‎/‎2018 at 4:38 AM, Christopher said:

Ultima Thule - an object New Horizon will pass by around New Year - is giving us it's first mystery.

 

We have already determined that it is not a sphere.

So we have been looking at it to figure out what light-curve it emits, to have more ideas in wich way it was not a sphere.

But there is no light curve. The light reflection is constants, as if it was a sphere.

 

http://pluto.jhuapl.edu/News-Center/News-Article.php?page=20181220

 

Every time a probe visits a new celestial object, we find something that makes scientists say, "WTF? We didn't expect that. And there's another batch of theories thrown into the Dumpster." (All said with big grins and occasional mad giggles.)

 

I would be surprised if Ultima Thule did not continue the tradition.

 

Dean Shomshak

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17 hours ago, DShomshak said:

 

Every time a probe visits a new celestial object, we find something that makes scientists say, "WTF? We didn't expect that. And there's another batch of theories thrown into the Dumpster." (All said with big grins and occasional mad giggles.)

 

I would be surprised if Ultima Thule did not continue the tradition. 

 

Dean Shomshak

The flyby will happen at 31st December/1st January. And we will have a high resolution image on earth about 1 day later. Currently taking a look at the twitter feeds:

https://twitter.com/nasanewhorizons
https://twitter.com/JHUAPL

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11 hours ago, Cancer said:

They seem to have reacquired the carrier frequency 15-20 minutes back, so the spacecraft survived close approach.

 

Cool pics will take longer.

That is the last image we got before the flyby happened:
aHR0cDovL3d3dy5zcGFjZS5jb20vaW1hZ2VzL2kv

 

We are not even certain if it is shaped like a bowling pin, or just two seperate objects in close orbit with each other from that.

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Hey, it could still be two Chthulhu eggs. Spawn of Ghroth. Whatever, Just very cold, as if that meant anything to the Outer Gods.

 

But seriously: As usual, the newly sighted object is like nothing we have seen before.First contact binary in the Solar System. Whee!

 

Dean Shomshak

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Well, a contact binary can be explained, but it was not at all expected.

 

Unfortunately, now we wait a week for more data, as the Sun is now between us and the spacecraft.

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This isn't really news; I just hadn't heard this point until today's meeting, in one of the prize lectures.

 

The neutron star - neutron star merger 18 months ago that was seen in gravitational waves, and in gamma rays, and then in other wavelengths  of electromagnetic waves, proves that the speed of light and the speed of gravitational waves are the same, to within one part in a quadrillion.  This absolutely rules out MOND (modified Newtonian dynamics, a theory that tweaks the law of gravitation as a way to explain the rotation curves of galaxies and some other observed astrophysical velocities without resorting to dark matter) and some other alternative theories of gravity, because one piece of these is that gravity and electromagnetism don't necessarily propagate at the same speed (something which is absolutely required in general relativity).  That limit of one part in a quadrillion comes from the difference in arrival times between the gravitational wave signal and the gamma-ray signal, a bit less than 2 seconds; that difference is a about a quadrillionth of the light travel time from the merging neutron stars to Earth.

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Back when physicists were in a tizzy over experiments that seemed to show neutrinos might travel faster than light, a letter to Science News made a similar point based on the near-simultaneous arrival of light and neutrinos from Supernova 1987A. Given the supposed discrepancy measured by the Italian experimenters, the neutrinos would have been detected some hours before the light. No such difference; therefore, the experimenters were in error. (And sure enough, the source of the error was figured out a few weeks later.)

 

I appreciate the Universe producing such natural experiments. They are excellent rebukes to the idiots who insist that "Oh, scientists just make it all up."

 

Dean Shomshak

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12 hours ago, DShomshak said:

Back when physicists were in a tizzy over experiments that seemed to show neutrinos might travel faster than light, a letter to Science News made a similar point based on the near-simultaneous arrival of light and neutrinos from Supernova 1987A. Given the supposed discrepancy measured by the Italian experimenters, the neutrinos would have been detected some hours before the light. No such difference; therefore, the experimenters were in error. (And sure enough, the source of the error was figured out a few weeks later.)

 

I appreciate the Universe producing such natural experiments. They are excellent rebukes to the idiots who insist that "Oh, scientists just make it all up."

 

Dean Shomshak

But...they Do make it up! They just make it up using facts....😋

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15 hours ago, DShomshak said:

Mm, if the astrophysicists are right and 95% of the universe consists of dark matter and dark energy, then atoms make up hardly anything.

 

Dean Shomshak

So they even made that one up? Typical Atoms!

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Well, when it comes to making up stuff, what Atoms lack in quantity they make up for in quality. They seem very creative. As a maker-up of stuff myself, I bow to my masters in the art. :hail:

 

Dean Shomshak

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