Showing all posts tagged: astronomy
5000 exoplanets pinpointed and given a sound signature
23 August 2022
Prior to 1992 exoplanets — being planets orbiting stars other than the Sun — were unheard of. While scientists believed they existed, thirty years ago none had been found. Today though exoplanets are the rule rather than the exception with over five thousand such bodies having been identified so far.
And with an estimated one-hundred-thousand-million stars in our galaxy, the Milky Way, it is likely many, many, more exoplanets will come to light. This nifty animation and sonification produced by NASA pinpoints the location of stars hosting exoplanets, while a pitch or chime conveys other information about the planet.
This animation and sonification tracks humanity’s discovery of the planets beyond our solar system over time. Turning NASA data into sounds allows users to hear the pace of discovery, with additional information conveyed by the notes themselves. As each exoplanet is discovered, a circle appears at its position in the sky. The size of the circle indicates the relative size of the planet’s orbit and the color indicates which planet detection method was used to discover it. The music is created by playing a note for each newly discovered world. The pitch of the note indicates the relative orbital period of the planet. Planets that take a longer time to orbit their stars are heard as lower notes, while planets that orbit more quickly are heard as higher notes.
The question now is how many exoplanets are capable of supporting life (as we know it), and is life present on any of these bodies.
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astronomy, exoplanets, science, video
Super clear photos of Jupiter taken by the Juno probe
3 August 2022
Image courtesy of NASA/Juno spacecraft.
A selection of some of the clearest photos taken so far, of Jupiter, the largest planet in the Solar System, by NASA’s Juno spacecraft. This stunning image dates from 2019. Juno has been photographing the gas giant since 2016, on a mission originally expected to last five years. NASA is hopeful however the probe will remain operational until 2025.
More of Juno’s photos can be seen here.
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astronomy, Jupiter, photography, science
Astronomers call for James Webb Space Telescope to be renamed
21 July 2022
While the images being collected by the newly operational James Webb Space Telescope have been stunning, some people are questioning whether the telescope should be named in honour of James Webb. Webb was NASA administrator from 1961 until 1968, and during his tenure he oversaw preparations for the early Apollo Moon flights.
But some astronomers and scientists are calling for NASA to rename the space telescope in light of allegations Webb persecuted LGBTQIA+ people, during, and before, his time as NASA administrator.
The telescope’s name has been criticised by many scientists amid allegations that Webb was linked to persecution of LGBTQ+ people in the 1950s and 1960s. The Lavender Scare witch-hunt resulted in the mass dismissal of gay and lesbian people from the US government service in the mid-20th century.
To date NASA has refused to yield, claiming there is no evidence supporting the allegations against Webb.
In September last year, NASA announced it would not change the telescope’s name. “We have found no evidence at this time that warrants changing the name of the James Webb space telescope,” NASA’s current administrator Bill Nelson said in a statement in September.
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First images from the James Webb Space Telescope
14 July 2022
NASA released the first images captured by the brand new James Webb Space Telescope (JWST), on Tuesday, and they did not disappoint.
The first operational JWST photo is of the SMACS 0723 galaxy cluster, which is a little over five billion light years distant. Incredible isn’t it? The cluster seems far closer. What we’re really seeing here though is a snapshot of the cluster as it appeared five billion years ago.
Check out the red streak, that looks a little like a forward-slash towards the bottom centre. According to Rebecca Allen, an astronomer at Swinburne University of Technology, this was a galaxy with many of its stars still forming. Five billion years later, it might look like our galaxy, the Milky Way, today.
Image courtesy NASA, ESA, CSA, STScI, Webb ERO.
This picture of the Southern Ring Nebula, also known as Eight-Burst Nebula, and Caldwell 74, depicts the death throes of a binary star. The cloud of dust, hydrogen, and ionised gas, surrounding the binary is about half a light year across.
Image courtesy NASA, ESA, CSA, and STScI.
The Carina Nebula, situated some 8500 light years from Earth, is the sort of image we love seeing from deep space telescopes. Brimming with colour, pearly bright stars in the foreground, and intrigue, these nebulae are akin to intricate tapestries.
Image courtesy NASA, ESA, CSA, and STScI.
Hands up who’s hanging out for the next batch of JWST images…
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astronomy, photography, science
What next after finding the goddamn Higgs boson particle?
14 July 2022
The Large Hadron Collider (LHC) is being fired up again after an extensive upgrade, and expectations are high the revamped particle collider will yield further of the universe’s secrets. Australian journalist Sherryn Groch has written about what scientists hope to learn in the next round of LHC experiments, as part of the Sydney Morning Herald Explainer series of articles.
For many people the LHC is most notable for finally confirming the existence of the elusive Higgs boson, nicknamed the goddamn particle by some scientists, on account of the difficulty they had finding it. The discovery though wasn’t quite the missing piece of the puzzle physicists expected it to be, says Dr Mitesh Patel, a lead researcher at CERN, giving rise to the possibility a fifth force of nature may exist, over and above the presently accepted four.
And then there’s the Higgs boson itself: it’s much lighter than expected. “It doesn’t really make sense on its own,” Patel says. “Everything about it tells us its mass should be much heavier. So, is something keeping it low? That’s what makes us think there’s something else.”
But the plot thickens. Shortly before the LHC was deactivated for upgrade, Patel and his team were struggling to make sense of data they had gleaned from older LHC experiments. What they were seeing didn’t stack up against the tenets of the Standard Model of physics, used to account for the four forces of nature, being electromagnetism, the weak force, the strong force, and gravity, even if the Standard Model does not actually explain gravity.
In the subatomic realm, particles interact and change all the time. And, according to the standard model, those known as beauty quarks should decay as often into muons as they do into electrons. But on the CERN team’s measurements, they became electrons 15 per cent more often than the muons, suggesting something could be tipping the scales.
Scientists are hoping further LHC experiments will also tell them more about dark matter, which coupled with dark energy, makes up ninety-five percent of the universe. But gravity remains the mystery. Standard Model does not account for it, and scientists are puzzled as to why it is far weaker than the other forces of nature. But they have some mind-boggling suggestions as to why:
[Some] speculate whether dark matter is really the effects of matter in another universe – gravity leaking through a multiverse into our own. It sounds like a Marvel film but Patel says “there are decent foundations” for the theory, namely that scientists still don’t understand why gravity is so much weaker than the other three forces of nature. “So people have speculated that maybe gravity behaves differently because it’s spread out in other dimensions in addition to our own”.
It is possible insights into these puzzles may be forthcoming sooner rather than later, once the LHC is up and running again. This I am looking forward to.
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Saturn’s rings and moons silhouette woodcut by Agnes Giberne
12 July 2022
The things you find while trawling through the The Public Domain Review… Agnes Giberne was a British novelist and science writer, who died aged 93 in 1939. As a writer her output was prolific.
Wikipedia lists one hundred and thirty books published under her name during her lifetime. On top of her writing though, Giberne was also an accomplished artist and illustrator.
The above illustration, titled “Ideal view of Saturn’s rings and satellites from the planet” is a silhouette woodcut from her book, Sun, Moon, and Stars: A Book for Beginners, which was published in 1898.
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Agnes Giberne, art, astronomy, illustration
2022 astronomy photographer of the year shortlist
7 July 2022
The 2022 astronomy photographer of the year shortlist was unveiled on Tuesday 5 July. The award, organised by the Royal Observatory Greenwich is in its thirteenth year, and the entries, as usual, never fail to amaze. Shortlisted images are on display at London’s National Maritime Museum until Sunday 7 August 2022, with the winners being announced on Thursday 15 September 2022.
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Space bubbles a Dyson sphere like solution to global warming?
15 June 2022
Dyson spheres are hypothetical mega-structures highly advanced planetary civilisations might construct around their host star to harness as much solar energy as possible to power their needs. Seen from a distance, a Dyson sphere would look like a massive shell almost completely encompassing a star.
It’d be like constructing a giant display case for the Sun. Needless to say building a Dyson sphere is no small undertaking, and would require an enormous quantity of resources, technological smarts, plus an unprecedented level of international cooperation. A single superpower could not take on an engineering feat of this scale alone, it’d be a team effort.
Dyson spheres have been in the news relatively recently. Fluctuations in the light of Tabby’s Star, located about 1,470 light-years from Earth, were puzzling astronomers, and the existence of a Dyson sphere was advanced as a possible explanation, though later ruled out.
While Dyson spheres, something late British American mathematician and physicist Freeman Dyson first wrote about in 1960, are unlikely to feature in our future anytime soon, the concept may help us combat global warming.
A team of MIT scientists have devised a solar filter of sorts, they call space bubbles. In short, a small structure made up of numerous of these space bubbles could be used to form a shield, deflecting a small, though sufficient amount of solar radiation away from the Earth.
The MIT scientists propose placing the space bubbles at the Lagrange point between the Earth and the Sun. Put simply, a Legrange point, is an area between two celestial objects, say the Earth and the Sun, where the gravity of both objects balance each other. For example if a satellite were placed at this Legrange point, it would stay put, and wouldn’t fall towards either the Earth or Sun.
Once in place, the space bubbles would act like an eclipsing body, in this case permanently blocking, or more like filtering, a small amount of the Sun’s rays reaching the Earth. While the proportion of solar radiation “blocked” would be minuscule, the MIT team say if just under two percent of “incident solar radiation” was deflected, current global warming could be fully reversed.
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astronomy, climate change, science
In ten billion years the universe will double in size
28 May 2022
The Hubble constant expresses the rate at which the universe is expanding. The problem is though, no one has been able to nail down a precise value for the constant. That is, until now.
When the Hubble Space Telescope was launched in 1990 the universe’s expansion rate was so uncertain that its age might only be 8 billion years or as great as 20 billion years. After 30 years of meticulous work using the Hubble telescope’s extraordinary observing power, numerous teams of astronomers have narrowed the expansion rate to a precision of just over 1%. This can be used to predict that the universe will double in size in 10 billion years.
That’s mind blowing. To say the least. The already enormous cosmos will one day be twice its present size. Too bad no one here today will be around to see it. But what does it matter anyway? Well, you’d be surprised. Given some two point two million new books are published every year, one can only imagine how many more publications there’ll be in ten billion years’ time.
With a much larger universe by then, it’s comforting to know there will be space to put them somewhere…
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How the rings of Saturn were formed
23 March 2022
From BBC Earth Lab. Many millions of years ago, one of Saturn’s erstwhile moons, strayed a little too close, crossed a line, the Roche Limit, and shattered into billions of pieces, having been torn apart by the immense gravity of the Solar System’s second largest planet.
Saturn’s incredible ring system was the result of this cataclysmic event, once the remnants of the moon, some seventeen trillion tons of icy material, spread out in orbit around the planet. It would have been an incredible spectacle to witness, had anyone been around to see it all happen.
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