Here we have to look for foreigners, according to astronomers

Astronomers have scanned the sky for foreign radio signals for decades, but so far they have heard a peep (with a possible exception). But according to a recent study, this could be due to the fact that they do not look at the right place at the right time. The State University astronomer of the University of Pennsylvania and his colleagues searched for 20 years of NASA’s Deep Space radio communications for indications of when and where our radio signals can be more visible to humans – and where to look for them. The group published their study at The letters of the astrophysical magazine.

How to watch a foreign space program (if any)

It makes sense that if there is an alien species out there with more or less our level of technology, they may do some of the same things we do: sending orbiters and rovers to explore other planets in their star, parking spaces At Lagrange pointsand maintaining contact with these spacecraft with radio. Thus, radio signals leaking from a hypothetical system of foreign stars may be very similar to those leaking from ours.

“Taking into account the direction and frequency of the most common signals gives us information about where we should try to improve our chances of detecting foreign technologies,” Fan said in a recent press release.

It turns out that NASA’s most powerful radio transmitters send signals to some parts of our solar system – mainly to Mars, with lateral series of other planets and jwst. We are not just signals out in the void and hoping to hear someone and we should not expect foreigners.

The fan and her colleagues studied 20 years of trunk from NASA’s Deep Space Network, a series of radio antennas parked in locations around the world, used by NASA to maintain contact with its distant spacecraft. The DSN carries radio signals to and from the James Webb Space Telescope, Mars Rovers, New Horizons and the Twin Voyager spacecraft – basically anything beyond the Earth’s low orbit or more than about 2,000 kilometers away from Earth. Inevitably, some of these radio waves are leaking around the edges of their aims and continue to go into space.

DSN transmitters are so powerful that aliens 23 years of light away could probably get stray radio waves from DSN (if they are out there and if they have a radio telescopes similar to ours). But they had to hear at the right place at the right time, according to the fan and her colleagues.

Here and when the team of astronomers say that we (and the hypothetical foreigners) must look for:

• Astronomers SETI should look for star -planets in about 23 years of light on earth.
• We need to have a view of the Star system, which means we need to look for systems where we can see the planets passing or passing in front of the host’s star from our view.
• And our absolute best chance of listening to a signal will come when two of these exoplanets transit at the same time, placing us in the right place to catch stray radio waves.

Mars (the bright object on the left) and Zeus (the point of light on the right) move towards a combination in this 2018 photo, which means they will overlap in the night sky. This would be a great time for foreigners at the right place to hear DSN broadcasts. And this bright series under the two planets is the path of the International Space Station. (Photo by: Alan Dyer/VW Pics/Uig through Getty Images)

Universal Images team through Getty Images

The gushes operates in the two ways

Any hypothetical opportunity for foreigners to watch the DSN should happen when Earth and Mars are lined up in their night sky (image a very tiny, very distant planetary eclipse), because NASA sends a lot of The radio marks forward and back to Mars.

Most of the deep -interval radio signals in DSN logs are sent to the spacecraft rotating around Mars (such as Mars Reconnaissance Orbiter and Mars Odyssey) or the Rovers passing around the surface. Any stray radio waves that go beyond Mars simply continue to go straight from Earth to Mars to … what lies farther along this line. Smart foreign astronomers, therefore, would look for human radio signals overnight, when Earth and Mars overlapped in the sky of their home world, placing their telescopes along the line that would travel its stray radio waves.

This means, of course, that our hypothetical foreigners should live on a planet whose star system is focused on the right path in relation to ours – which is merely the fortune of the secular draw. Most of the planets (and even most of the smaller objects) in our solar system rotate the sun more or less on a flat tray. This means that when NASA sends instructions on the spacecraft on other planets or even to JWST, it sends these broadcasts along the disc, not in space at random angles.

Alien Seti astronomers will have almost no luck, unless they have a view of our solar system. They could stay that our system was uninhabited – or at least that no one was smart enough to build a work radio. In the meantime, astronomers here on Earth face the same problem. If there is an alien species out there with his own versions of NASA and DSN, we will not be very fortunate to violate them unless their star system is oriented to ours.

There is also an element of luck there, of course. A foreign astronomers watching a transit of Earth and Mars together will have a much better chance of detecting a signal than one watching a passage, say, Aphrodite and Neptune.

“If an extraterrestrial intelligence was in a position that could observe the alignment of Earth and Mars, there is a 77% chance that it would be on the path of one of our broadcasts,” the fan said, “ranks more likely than being in a random position in a random position.” On the other hand, if the aliens themselves saw the sky when the Earth and another planet solar system lined up, they would be about 12% chance of catching a stray radio broadcast intended for a spacecraft such as Juno, which is orbit around Jupiter (for now).

But chances are even better than listening to random times, or in a star system that has leaning wrong.

Greenbelt, MD-22 November: Employees in clean costumes are next to the (R) Roman telescope in the cave clean room that is 125 feet long, 100 feet wide and 90 feet, Greenbelt, Maryland on November 22 2024 (Photo by Michael S. Will

The Washington Post through Getty Images

Time is the key, for foreigners and for astronomers

Taking the law of time is almost impossible work right now, but this is likely to change in the coming years. Astronomers have discovered very few star systems with two more exoplanets. This is part of the because Trappist-1 and his seven visible worlds are so great. But if NASA starts the Roman space telescope in 2027 in time, it could change dramatically.

“With the upcoming launch of NASA’s Roman Space Telescope, we expect to detect one hundred thousand previous detected exoplanets, so the possible search area should be significantly increased,” Fan said. This also means that astronomers will be able to calculate the orbits of these planets so they can predict when the planets will be aligned – and this is the best time to hear control of the extraterrestrial mission by speaking in its version of the Curiosity spacecraft or spacecraft.

After all, this is the truly fun place for all this idea – if we manage to get a radio signal during the future planetary alignment, we will probably hear in a kind of doing the same thing we do: starting to explore his little cosmic neighborhood.

And maybe even listening to.