Extraterrestrial life or alien life is life which may occur outside Earth and which did not originate on Earth. No extraterrestrial life has yet been conclusively detected. Such life might range from simple forms such as prokaryotes to intelligent beings, possibly bringing forth civilizations that might be far more advanced than humanity. The Drake equation speculates about the existence of sapient life elsewhere in the universe. The science of extraterrestrial life is known as astrobiology.Speculation about the possibility of inhabited worlds beyond Earth dates back to antiquity. Early Christian writers discussed the idea of a "plurality of worlds" as proposed by earlier thinkers such as Democritus; Augustine references Epicurus's idea of innumerable worlds "throughout the boundless immensity of space" (originally expressed in his Letter to Herodotus) in The City of God. In his first-century poem De rerum natura (Book 2:1048–1076), the Epicurean philosopher Lucretius predicted that humanity would find innumerable exoplanets with life-forms similar to, and different from, the ones on Earth, and even other races of man.Pre-modern writers typically assumed extraterrestrial "worlds" are inhabited by living beings. William Vorilong, in the 15th century, acknowledged the possibility that Jesus could have visited extraterrestrial worlds to redeem their inhabitants. Nicholas of Cusa wrote in 1440 that Earth is "a brilliant star" like other celestial objects visible in space, which would appear similar to the Sun from an exterior perspective due to a layer of "fiery brightness" in the outer layer of the atmosphere. He theorised all extraterrestrial bodies could be inhabited by men, plants, and animals, including the Sun. Descartes wrote that there was no means to prove that the stars were not inhabited by "intelligent creatures", but their existence was a matter of speculation. The writings of these individuals demonstrate interest in extraterrestrial life has existed throughout history, although only recently have humans have had any means of investigating it.Since the mid-20th century, active research has taken place to look for signs of extraterrestrial life, encompassing searches for current and historic extraterrestrial life, and a narrower search for extraterrestrial intelligent life. Depending on the category of search, methods range from the analysis of telescope and specimen data to radios used to detect and transmit communications.The concept of extraterrestrial life, and particularly extraterrestrial intelligence, has had a major cultural impact, especially extraterrestrials in fiction. Science fiction has communicated scientific ideas, imagined a wide range of possibilities, and influenced public interest in and perspectives on extraterrestrial life. One shared space is the debate over the wisdom of attempting communication with extraterrestrial intelligence. Some encourage aggressive methods to try to contact intelligent extraterrestrial life. Others – citing the tendency of technologically advanced human societies to enslave or destroy less advanced societies – argue it may be dangerous to actively draw attention to Earth.
Source: Extraterrestrial life (wikipedia.org)
Many astronomers are no longer asking whether there is life elsewhere in the Universe. The question on their minds is instead: when will we find it?
BBC NewsA Nasa probe into hundreds of UFO sightings found there was no evidence aliens are behind unexplained phenomena, but the space agency also could not rule out that possibility.If the truth is out there, this long-awaited report offers no conclusive evidence.
Nasa's James Webb Space Telescope may have discovered tentative evidence of a sign of life on a faraway planet. It may have detected a molecule called dimethyl sulphide (DMS). On Earth, at least, this is only produced by life.
It was just a normal day's flying for Alex Dietrich – until it wasn't. Streaking through the sky over the tranquil expanse of the Pacific Ocean near San Diego, the US Navy lieutenant commander was taking her F/A-18F Super Hornet fighter jet on a training mission with a colleague in another plane.
According to many of our cultural touchstones, there’s only one thing for it if extraterrestrials ever take a cosmic detour to our planet: heavy artillery fire.
American authorities have examined around 800 mysterious reports of unidentified flying objects collected over decades - but only a small fraction are truly unexplained, a panel of researchers says.
The European Space Agency will make another attempt on Friday to launch its Jupiter Icy Moons Explorer (Juice). Thursday's bid was thwarted by concerns about lightning over the Kourou spaceport in French Guiana.
Be a part of our first Limited Drop, which honors our Cosmic Pioneers and their noble expeditions: https://kgs.link/limited-drop. Stocks are limited – so grab yours before they’re gone for good! Sources & further reading: https://sites.google.com/view/sources-grabby-aliens/ The universe is mag
Thank you to Brilliant for Supporting PBS. To learn more go to https://brilliant.org/SpaceTime/ PBS Member Stations rely on viewers like you. To support your local station, go to:http://to.pbs.org/DonateSPACE Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbssp
Rocks in the Australian Outback dating back 3.5 billion years may help scientists work out whether there has ever been life on Mars. Researchers studying the Australian rocks say only ancient microbes could have shaped them the way they are.
To check out any of the lectures available from Great Courses Plus go to http://ow.ly/dweH302dILJ We’ll soon be capable of building self-replicating robots. This will not only change humanity’s future but reshape the galaxy as we know it. Get your own Space Time tshirt at http://bit.ly/1Qlzo
Check Out Matt on Fate & Fabled Here: https://youtu.be/utJZ8YmXOnc PBS Member Stations rely on viewers like you. To support your local station, go to:http://to.pbs.org/DonateSPACE Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime Our solar system is
Nasa's Perseverance rover has reached a big moment in its mission on Mars. Tuesday will see the six-wheeled robot begin the climb up an ancient delta feature in the crater where it landed.
English science-fiction writer Arthur C. Clarke discusses the on-going research in astronomy into discovering new planets and how he believes there is life on other planets, although we don't know it yet. Date aired - July 12, 1972 - Arthur C. Clarke and Cassie Mackin For clip licensing opportun
Thank you to Morning Brew for supporting PBS. To learn more and sign up go to https://cen.yt/mbpbsspace PBS Member Stations rely on viewers like you. To support your local station, go to:http://to.pbs.org/DonateSPACE At just four light years away, Proxima Centauri is our closest solar neighbor. Th
Researchers believe there may be a planet that could sustain life, in the vicinity of a dying sun. If confirmed, this would be the first time that a potentially life-supporting planet has been found orbiting such a star, called a "white dwarf".
PBS Member Stations rely on viewers like you. To support your local station, go to:http://to.pbs.org/DonateSPACE ***** Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime On our search for alien lifeforms we scan for primitive biosignatures, and wait a
Getting something from the kurzgesagt shop is the best way to support us and to keep our videos free for everyone. Thank You! ►► https://kgs.link/shop. (Worldwide Shipping Available) Sources & further reading: https://sites.google.com/view/sources-darkforest/ The Universe is incredibly big and
There's an air of relief in the science team running the American space agency's (Nasa) Perseverance rover on Mars. The researchers are sure now they've sent the robot to a location that provides the best possible opportunity to find signs of ancient life.
It's not possible for life to exist in the clouds of Venus. It's simply too dry, says an international research team led from Queen's University Belfast, UK.
The US government has said it has no explanation for dozens of unidentified flying objects seen by military pilots. It does not rule out the possibility that the objects are extra-terrestrial.
A highly anticipated US government report on UFOs (unidentified flying objects) has just been released. Here's what we know so far. The unclassified report was demanded by Congress after numerous reports from the US military of vehicles seen moving erratically in the sky.
image copyrightGetty ImagesA US government report on sightings of unidentified flying objects (UFOs) found no evidence of alien activity but does not rule it out, officials have told US media.The review of 120 incidents is expected to conclude that US technology was not involved in most cases.
It's an extraordinary possibility - the idea that living organisms are floating in the clouds of Planet Venus. But this is what astronomers are now considering after detecting a gas in the atmosphere they can't explain.
Trundling across the surface of Mars as you read this is a remarkable machine. Perseverance – the car-sized rover that safely touched down on the Martian surface on 18 February this year – might only have a top speed of less than 0.
Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime There’s one rule on Space Time: It’s never Aliens. But every rule has an exception and this rule is no exception because: It’s never aliens, until it is. So is it aliens yet? And on today’s Spac
To learn to think like a scientist check out http://Brilliant.org/SpaceTime To repeat the space time maxim: it’s never aliens … until it is. So let’s talk about ‘oumuamua. You can further support us on Patreon at https://www.patreon.com/pbsspacetime Get your own Space Time t-shirt at
Nasa's Perseverance rover, due to launch to Mars this summer, will search an ancient crater lake for signs of past life. But if biology ever emerged on the Red Planet, how will scientists recognise it? Here, deputy project scientist Ken Williford explains what they're looking for.
There's a new robot on the surface of Mars. The American space agency has successfully landed its Perseverance rover in a deep crater near the planet's equator called Jezero.
Nasa is sending a spacecraft to the icy world of Europa, which holds an ocean under its frozen outer shell. Scientists have long regarded the moon as one of the most promising targets in the search for life elsewhere in our Solar System.
Extraterrestrial life,[n 1] sometimes colloquially referred to as alien life, is life that may occur outside Earth and which did not originate on Earth. No extraterrestrial life has yet been conclusively detected, although efforts are underway.
Could "shadow life" be lurking in the deep ocean? Never mind Mars, alien life may be thriving right here on Earth, a major science conference has heard.
There is now even more evidence that life on Earth may have been seeded by material from asteroids or comets. Prior research has shown how amino acids - the building blocks of life - could form elsewhere in the cosmos.
US scientists have found further evidence that huge seas existed long ago on Mars. The 2,000 km-wide, 8km-deep Hellas basin is a giant impact crater - the largest such structure on Mars.
For decades, scientists have been sending robotic probes deep into the Solar System, revealing a diverse and dynamic array of worlds orbiting the Sun. Unmanned spacecraft have transformed understanding of our cosmic neighbourhood. But this avalanche of data has also thrown up many new questions.
It may not rank as the most compelling reason to curb greenhouse gases, but reducing our emissions might just save humanity from a pre-emptive alien attack, scientists claim.
Not many scientists are prepared to take tales of alien abduction seriously, but John Mack, a Harvard professor who was killed in a road accident in north London last year, did. Ten years on from a row which nearly lost him his job, hundreds of people who claim they were abducted still revere him.
The next generation of telescopes could reveal the presence of oceans on planets outside our Solar System. Detecting water on Earth-like planets offers the tantalising prospect they could sustain life.
Seti, the Search for Extraterrestrial Intelligence, has until now sought radio signals from worlds like Earth. But Seti astronomer Seth Shostak argues that the time between aliens developing radio technology and artificial intelligence (AI) would be short.
While searching deep space for extra-terrestrial signals, scientists at the Arecibo Observatory in Puerto Rico have stumbled across signals broadcast from Earth nearly half a century ago. Radio astronomer Dr.
The hunt for other intelligent civilisations has a new technique in its arsenal, but its first use has turned up no signs of alien broadcasts. Australian astronomers used "very long baseline interferometry" to examine Gliese 581, a star known to host planets in its "habitable zone".
The US government has formally denied that it has any knowledge of contact with extraterrestrial life. The announcement came as a response to submissions to the We The People website, which promises to address any petition that gains 5,000 signatories.
The powerful vision of the Hubble Telescope - which turns 20 this week - has expanded our cosmic horizons and brought into sharper focus a new set of mysteries about the universe that is our home. To those whose science is gleaned from the media, astronomy may seem to be on a roll. And it is.
The first public congressional hearing into UFO sightings in the US in over 50 years ended with few answers about the unexplained phenomenon. Two top military officials tasked with probing the sightings said that most can ultimately be identified.
US defence officials have announced the launch of a task force to investigate reports of unidentified flying objects in restricted airspace. The group will assess objects of interest and "mitigate any associated threats", the Pentagon said on Tuesday.
The US Department of Defense has released three declassified videos of "unexplained aerial phenomena". The Pentagon said it wanted to "clear up any misconceptions by the public on whether or not the footage that has been circulating was real".
extraterrestrial life life extraterrestrial alien UFO