science | M Thomas Apple Author Page

In search of dark energy and dark matter

July 3, 2023
MThomas

A European-built orbital satellite was launched into space on Saturday from Florida on a mission to shed new light on dark energy and dark matter, the mysterious cosmic forces scientists say account for 95% of the known universe.
https://www.theguardian.com/science/2023/jul/01/euclid-telescope-lifts-off-in-search-of-the-secrets-of-dark-universe

Like the James Webb telescope, the Euclid will be positioned in a LaGrange point (L2, in this case), rather than in high Earth orbit.

If all goes well.

It’s interesting that the Guardian article says the telescope was “designed and built entirely by Esa,” although NASA supplied parts and its launching pad was made available and the telescope was launched using a SpaceX rocket. And ESA consists of nearly 2000 scientists from the US, Canada, and Japan as well as various European countries.

It’s a joint project. That’s how science should work in the first place.

(For more on dark matter, dark energy, gravity, and quantum mechanics, check this out.)

Phosphorus on Enceladus boosts chances for life?

July 2, 2023
MThomas

According to legend, the ancient giant Enceladus vents sulfur from his tomb. According to data, Saturn’s tiny moon Enceladus vents more than that.
https://www.astronomy.com/science/phosphate-find-on-enceladus-boosts-chances-for-life/

Scientists have suspected for a long time that this tiny moon of Saturn may be the best place in our solar system to look for life.

Now they have confirmed evidence of all six crucial elements necessary for life to exist (life as we know it, anyway): carbon (C), hydrogen (H), nitrogen (N), oxygen (O), phosphorus (P), and sulphur (S). If present as a phosphate, essential for DNA and RNA to exist, the discovery of phosphorus on the 310-mile-wide Enceladus may indicate life of sort sort, perhaps at a microscopic level beneath the icy surface.

One guess is that the oceans of Enceladus have at least 100 times more phosphorus than the Earth’s oceans. That would make for quite the carbonated fizzy pop. Methane has already been seen coming out out of various “ice geysers” (a.k.a. cryovolcanoes). Since methane results from rotten organic material, there logically should be something alive out there.

Now we just have to get back out there and figure out a way to find them.

Chemical traces reveal first-generation stars

June 16, 2023
MThomas

The link below includes a night sky in Montana, which makes little sense when the researchers were in Beijing and Honolulu…

“The first-generation star we observed has the potential to become the oldest star we have ever seen,” said Alexander Heger, a professor in the school of physics and astronomy at Monash University in Australia who was part of the research team. “It probably had only lived for 2 1/2 million years and then exploded.”
https://www.nbcnews.com/science/space/chemical-traces-offer-evidence-universes-earliest-stars-rcna88790

Oh, and it also was discovered to be 260 times the size of our own Sun…just as theorized.

More importantly, this involved scientists from three different countries (China, Japan, and Australia), sharing information and working together for science.

Imagine if that spirit of cooperation could be extended into other domains…

Plume of water seen on Saturn’s moon

May 31, 2023
MThomas

The record-breaking plume reached nearly 6,000 miles into space – covering the distance between Ireland and Japan – and poured water into the void at an estimated rate of 300 litres a second.
https://www.theguardian.com/science/2023/may/30/astronomers-see-6000-mile-water-vapour-plume-blasting-from-saturn-moon

Note that the water jetted out into space nearly 40 times longer than the actual size of the moon (about 500 in diameter, or as the Gurdian puts it “500-mile-wide” for those who forgot the meaning of “diameter).

Enceladus is probably the best bet for life elsewhere in the solar system due to its water — and while whipping around Saturn once per day, which is likely the reason for underwater volcanos and other vents that may provide the proper chemistry for life.

Also the perfect place to trick an inexperienced asteroid hunter crew…

Betelgeuse! Betelgeuse! Betel…

May 26, 2023
MThomas

Betelgeuse, the closest red giant to Earth, has long been understood to move between brighter and dimmer in 400-day cycles. But from late 2019 to early 2020, it underwent what astrophysicists called “the great dimming”, as a dust cloud obscured our view of the star.

Now, it is glowing at 150% of its normal brightness, and is cycling between brighter and dimmer at 200-day intervals – twice as fast as usual…It is currently the seventh brightest star in the night sky – up three places from its usual tenth brightest.
https://www.theguardian.com/science/2023/may/26/its-new-territory’s-why-is-betelgeuse-is-glowing-so-brightly-and-behaving-so-strangely?

Betelgeuse is the closet red giant Star to our solar system, one of the shoulders of the Greek constellation of Orion.

The cultural information in the linked article was actually more interesting than the phenomenon observed. For instance, the fact that an Aboriginal people in Australia saw it long before the Greeks did was something I didn’t know.

(Although ancient humans in what is now Germany apparently carved an image of it around 32,000 years ago…)

And that the Greek name comes originally from the Arabic “bat al-jawzāʾ” meaning “giant’s shoulder.”

And all three cultures saw the star as connected with fire held by a giant hunter of some sort.

And so have ancient Babylonians, Egyptians, and probably everyone else, too. We just can’t help personifying even the stars.

The kicker?

When it does eventually explode, it could – over the course of a week – grow so bright that it will be visible during daylight, and cast shadows at night.

Now that’s something I’d like to be around to see. Hmm. If only I could manage to live for another 10- to 100,000 years…

Cancel your asteroid insurance – for the next thousand years

May 22, 2023
MThomas

Of all the asteroids they modeled, the one with the largest risk of impact was a kilometer-wide asteroid known as 1994 PC1. Over the next thousand years, the probability that 1994 PC1 will cross within the orbit of the Moon is a paltry 0.00151%, hardly worth worrying about.
https://www.yahoo.com/entertainment/cancel-asteroid-insurance-earth-declared-150002866.html

Thanks to Glen Hill over at Engagin’ Science (formerly Scientia, which apparently was far too Latin- and science-esque for search engines to handle) for bringing this (not-so Earth-shattering) info to my attention.

Sorry, folks. Hollywood was once again wrong (sigh).

😂

A taste of Scientia

May 5, 2023
MThomas

The word has just come in that a fellow traveler has set up his own blog about science.

It’s called Science.

(In Latin, Scientia.)

Glen is a good friend of mine, and not only is he a good scientist, he’s also a good writer. His avowed goal is to raise science literacy and share his love of science with the world.

We may even steal posts from each other from time to time. Or photos (like the one above ⬆️🌏).

Check it out: https://scientiameansscience.blogspot.com

fMRI, GPT-1, and your brain

May 3, 2023
MThomas

Scientists have found a way to decode a stream of words in the brain using MRI scans and artificial intelligence.
https://www.npr.org/sections/health-shots/2023/05/01/1173045261/a-decoder-that-uses-brain-scans-to-know-what-you-mean-mostly

While not perfect, this is some seriously scary stuff.

FWIW the researchers themselves did recognize this…

Although it’s nowhere near being able to decode spontaneous thoughts in the real world, the advance raises concerns that, with improvement, the technology might mimic some type of mind reading. “Our thought when we actually had this working was, ‘Oh my God, this is kind of terrifying,’” Huth recalls.
https://www.science.org/content/article/scientists-use-ai-decipher-words-and-sentences-brain-scans

Participants have to consent to being “read,” and there are ways to prevent the software from figuring out even the “gist” of what they were thinking.

Still, imagine if some nefarious criminal group (or governmental agency, if there is a difference) decided to force someone to consent to have their thoughts read.

Long distance.

Permanently.

It’s getting harder and harder to distinguish scifi from reality.

Another day, another JAXA failure

April 12, 2023
MThomas

The bankruptcy filing by Richard Branson’s Virgin Orbit Holdings Inc (VORB.O) has dealt a blow to Japan’s hopes of building a domestic space industry, with plans for a Kyushu-based spaceport designed to attract tourism on hold for lack of funding.
https://www.reuters.com/business/aerospace-defense/virgin-orbit-bankruptcy-casts-shadow-over-japans-space-dreams-2023-04-07/

Granted, this news is from four or five days ago.

Still, it’s jarring to see TV news about JAXA and NASA doing “joint” explorations of Mars, and then see a constant failure of JAXA to do anything based in Japan.

Something is seriously wrong with this space agency. And I suspect it has nothing to do with the scientists or astronauts.

Artemis crew to be most diverse Moon crew

April 8, 2023
MThomas

The astronauts will be the first humans to fly in the vicinity of the moon in more than 50 years. They will also be the first to launch aboard NASA’s next-generation megarocket and Orion space capsule. The crew will not land on the moon but will swing around the celestial body, testing the performance of the Orion spacecraft, before returning to Earth.
https://www.nbcnews.com/science/space/nasa-announces-astronauts-will-orbit-moon-year-rcna77896

They won’t land, only orbit. But a first is a first.

Let’s go to Mars, already.

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