Nasa has received a “heartbeat” signal from its Voyager 2 spacecraft – but it is still lost in space. Over the weekend, Nasa announced that it had lost contact with Voyager 2, which was launched in 1977 and is now hovering on the edge of the solar system. The space agency had inadvertently sent a message to the craft that instructed it to turn its antenna two-degrees from Earth. That in turn meant that it lost contact with the Deep Space Network, or DSN, a collection of ground-based antennas that allow for contact with distant spacecraft. Engineers feared that they would not hear from Voyager 2 until October at the earliest. Then, it will automatically adjust itself, resetting its orientation and pointing the spacecraft back towards the Earth, when the space agency hoped it would make contact. But Nasa has now heard a “carrier signal” from Voyager 2, sent back as the Deep Space Network scanned the sky. The space agency compared the signal to a “heartbeat”, in that it confirms that the probe is still safe and sending messages back down to Earth. Engineers will now try and send commands to Voyager 2, instructing it to re-orient itself and point back at Earth. If that happens then it will be able to continue on again as normal, flying out into interstellar space and providing scientists with information as it goes. The instructions might not get through, however. If that happens then engineers will be powerless to correct their mistake. That will mean they will be back to waiting until October, which will bring the point at which the spacecraft’s software will automatically tell it to reset its direction. Read More Giant space ‘umbrella’ tethered to asteroid could protect Earth from climate crisis Songs, books and films inspired by the blue moon ESA’s Euclid space telescope captures glittering galaxies and stars in first images

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It’s not quite the lost city of Atlantis, but scientists have just uncovered a slice of history that had been swallowed up by the sea. Experts admitted that even they were surprised when divers unearthed a 7,000-year-old stone road that had lain buried under layers of sea mud. The ancient structure was discovered after archaeologist Igor Borzić, of the University of Zadar, spotted “strange structures” nearly 16 ft (5m) underwater in the Bay of Gradina, off the coast of Croatia. The submerged road once linked the island of Korčula to an artificial, prehistoric settlement that belonged to a maritime culture known as the Hvar. Sign up for our free Indy100 weekly newsletter The university released footage of the incredible finding over the weekend. It showed the passageway which consisted of stacked stones and measured some 12 ft (around 4m) across. Archaeologists believe people walked this road “almost 7,000 years ago”, with radiocarbon dating of wood near the site suggesting the settlement may have been built around 4,900 BC. “In underwater archaeological research of the submerged neolithic site of Soline on the island of Korčula, archaeologists found remains that surprised them,” the University of Zadar said in a Facebook statement. “Namely, beneath the layers of sea mud, they discovered a road that connected the sunken prehistoric settlement of the Hvar culture with the coast of the island of Korčula.” Borzić and his team also discovered another “almost identical” settlement on the other side of Korčula Island. Neolithic artefacts including a stone axe, cream blades and sacrificial fragments, were found at the site which lay at a depth of 4-5m. Understandably, the researchers were delighted and, as they continue to delve into their nation’s past, we wonder what else they’ll unearth. Have your say in our news democracy. Click the upvote icon at the top of the page to help raise this article through the indy100 rankings.

The meaning of life is the ultimate mystery – why do we exist? And is there a point to… well… anything? These are questions to which we may never find answers, but at least we can define what “life” means in scientific terms. And yet, our understanding of what life is is changing all the time, thanks to space exploration. As scientists continue to hunt for life beyond our own world, biologists are having to rethink the meaning of the word “life” itself. Sign up for our free Indy100 weekly newsletter Generally, biologists explain “life” as connoting a self-sustaining chemical system which is capable of performing functions such as eating, metabolising, excreting, breathing, moving, growing, reproducing, and responding to external stimuli. This definition works pretty well here on Earth (although there are some important exceptions, such as viruses), but experts have pointed out that if life exists elsewhere in the universe, it may not display the same properties that we’re used to. Indeed, it might be unrecognisable as life as we know it (forget those little green men). In which case, how will we spot it if it ever crosses our path? Astrobiologist Sara Imari Walker and chemist Lee Cronin think they’ve come up with a solution. The pair are now arguing that highly complex molecules found in all living creatures can’t exist thanks purely to chance. Therefore, they say, the universe must have a way of creating and reproducing complex information and retaining a “memory” of all of this.. In an interview with New Scientist, Walker, of Arizona State University, explained their radical idea on how objects come into existence. The concept, known as Assembly Theory, explains why certain complex objects have become more abundant than others by considering their histories. If the theory proves correct, it will redefine what we mean by “living” things and show that we’ve been going about the search for extraterrestrial life all wrong. In the process, we could even end up creating alien life in a laboratory, she stressed. In her discussion with New Scientist, Walker pointed out: "An electron can be made anywhere in the universe and has no history. You are also a fundamental object, but with a lot of historical dependency. You might want to cite your age counting back to when you were born, but parts of you are billions of years older. "From this perspective, we should think of ourselves as lineages of propagating information that temporarily finds itself aggregated in an individual." Assembly theory predicts that molecules produced by biological processes must be more complex than those produced by non-biological processes, as Science Alert notes. To test this, Walker and her team analysed a range of organic and inorganic compounds from around the world and outer space, including E. coli bacteria, urine, meteorites and even home-brewed beer. They then smashed up the compounds into smaller pieces and used mass spectrometry to pinpoint their molecular building blocks. They calculated that the smallest number of steps required to reassemble each compound from these building blocks was 15. And whilst some compounds from living systems needed fewer than 15 assembly steps, no inorganic compounds made it above this threshold. "Our system … allows us to search the universe agnostically for evidence of what life does rather than attempting to define what life is," Walker, Cronin, and others wrote in a 2021 Nature Communications article. The handy thing about this building block system – which they’ve dubbed the “'molecular assembly index” – is that it doesn’t rely on carbon-based organic materials to be identified. In other words, an alien could be made of entirely different stuff entirely and we’d still be able to spot it as life using the index. It also works regardless of what stage of “life” an extraterrestrial being is in – whether it is still in its infancy or has moved into a technological stage beyond our understanding. That’s because all of these states produce complex molecules which couldn’t exist in the absence of a living system. If all of this is hurting your head, let’s just get back to the basics: if there is a secret to life, it might all be down to what we do, not what we are. Have your say in our news democracy. Click the upvote icon at the top of the page to help raise this article through the indy100 rankings.

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Nasa’s James Webb telescope’s most recent image of a distant star system has thrown up more questions than answers – literally. The image is of the star system Herbig Haro 46/47, and includes a cosmic object that is shaped like an actual question mark. Scientists think the entity could be a distant galaxy, or two galaxies interacting with one another. One larger galaxy could be distorting the cosmic cloud and gas of the other, for example, forming a shape similar to a question mark. Sign up to our free Indy100 weekly newsletter The red colour of the unusually shaped object in the image suggests it is more distant than the other stars in the picture. “This may be the first time we’ve seen this particular object. Additional follow-up would be required to figure out what it is with any certainty. Webb is showing us many new, distant galaxies – so there’s a lot of new science to be done,” the US’s Space Telescope Science Institute, which manages Webb’s science operations, told Space.com. The star system in the foreground, dubbed Herbig-Haro 46/47, was captured by the Webb telescope’s powerful infrared cameras and consists of two young stars pulled to each other by gravity as they spin. An image reveals the stars as buried deeply, appearing as an orange-white splotch, surrounded by a disk of gas and dust that continued to add to their mass. JWST Finds a Cosmic Question Mark and a Starry Fountain www.youtube.com “Herbig-Haro 46/47 is an important object to study because it is relatively young – only a few thousand years old,” Nasa said in a statement. The pair of actively forming stars have two-sided orange lobes which were created by earlier ejections from these stars. Scientists said the two young stars could give more insight into how stars gather mass over time, given the fact that the process usually takes millions of years. Have your say in our news democracy. Click the upvote icon at the top of the page to help raise this article through the indy100 rankings.

UPDATE: Jun. 16, 2023, 4:55 p.m. EDT This story has been updated with the latest

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