has nasa ever recieved any kind of unknown signal from space that they think might be alien communication??

Answer 1

Yes, a few times over its history and they were very interesting. There was the time when they received pulses a few "hundred times a second." That's right pulses a few hundred times a second, this could only be from a civilization. What in nature, especially astronomy pulsed so strong, that fast that it could reach another star system? Well, they're called Pulsars.

The first pulsar was discovered by chance by Jocelyn Bell and Anthony Hewish in 1967 who were actually studying distant galaxies at the time. Jocelyn Bell noticed small pulses of radiation when their telescope was looking at a particular position in the sky and for a short time scientists thought they might be coming from an extra-terrestrial civilisation. In fact the source of these pulses were initially referred to as LGM1, Little Green Man 1. Once established that the signals were not of this origin (and also not caused by people on Earth), the unidentified object they were coming from was called a "pulsar" because the emission was pulsed.
http://outreach.atnf.csiro.au/education/everyone/pulsars/

Then there are Quasars and other exotics systems that have surprised scientists with their signals, only later to be discovered natural.

Answer 2

Because of the sensationalism of such a signal, reputable scientists have learned to be cautious about publicity of possible signals. There have been several possible signals that I know of, but extensive follow-up has ruled them all out as definitely being alien communication. Most proved to be man-made interference of some sort. Others were one-time events that might have had natural causes or simply been instrument malfunctions. Naturally, among the many, many signals received there are some unexplained oddities, but attributing such things to alien communication is unwarranted.

By the way, it's not NASA who look for such signals anymore---Congress defunded all SETI research at NASA about a decade ago.

Answer 3

Once in a while we thought we had some, but after investigation the source was determined. And it was not from aliens.
Try again the strength of a signal is inverse as the square of the distance. another the microwave signals are very directive so where it is pointed ,very slim chance.

Answer 4

Not that they've told anyone about. SETI has picked up signals of interest from space though. While the source of them hasn't been identified there's no evidence to suggest aliens sent them.

Answer 5

back in the late 60's or early 70's a radio telescope discovered a sub- band signal and termed it LGM for Little Green Men. Later they determined it was called a Pulsar.

Answer 6

NASA did no longer take this photograph. examine the caption: "Pictured above, Hanny's Voorwerp replaced into imaged at present by potential of the 4.2-meter William Herschel Telescope interior the Canary Islands by potential of Matt Jarvis, Kevin Schawinski, and William Keel." This telescope is a factor of the Isaac Newton group of Telescopes, a worldwide consortium of the technology and technologies centers Council of the united kingdom, the Nederlandse Organisatie voor Wetenschappelijk Onderzoek of the Netherlands, and the Instituto de Astrofísica de Canarias in Spain. lots of the APOD photos are from sources different than NASA, including photos take by potential of hundreds of newbie astronomers. besides the certainty that the APOD is hosted on NASA's information superhighway internet site, it somewhat is compiled from photos taken by potential of newbie and expert astronomers from all worldwide.

Answer 7

No that I know of. Astronomers (not NASA) have been searching the skies for signals for years now. No luck so far.

Answer 8

Maybe, but like any other, one must be proven before it should be announced. And as far as I know, astronomers might also hide not just signals, and maybe, creatures, that they dont wanted to exposed it to the public and for them to know first its properties, skills/abilities, etc...

Answer 9

Yes, they rebroacast the signals and we call it The Rush Limbaugh program.

Answer 10

No. And even SETI which is purposely looking for such signals has not received any.