Pic of the Week: The Dance of R Aquarii

Posted on by onespaceman2000
Image (Credit): The R Aquarii binary star system. (NASA, ESA, Matthias Stute , Margarita Karovska , Davide De Martin (ESA/Hubble), Mahdi Zamani (ESA/Hubble))

This week’s image is from the Hubble Space Telescope. It shows a brilliant pattern in the sky about 700 light-years away. It is the product of an odd dance between two symbiotic stars, one red and the other white.

Here is more information about the image from the Hubblesite:

Located approximately 700 light-years away, a binary star system called R Aquarii undergoes violent eruptions that blast out huge filaments of glowing gas. The twisted stellar outflows make the region look like a lawn sprinkler gone berserk. This dramatically demonstrates how the universe redistributes the products of nuclear energy that form deep inside stars and jet back into space.

R Aquarii belongs to a class of double stars called symbiotic stars. The primary star is an aging red giant and its companion is a compact burned-out star known as a white dwarf. The red giant primary star is classified as a Mira variable that is over 400 times larger than our Sun. The bloated monster star pulsates, changes temperature, and varies in brightness by a factor of 750 times over a roughly 390-day period. At its peak the star is blinding at nearly 5,000 times our Sun’s brightness.

When the white dwarf star swings closest to the red giant along its 44-year orbital period, it gravitationally siphons off hydrogen gas. This material accumulates on the dwarf star’s surface until it undergoes spontaneous nuclear fusion, making that surface explode like a gigantic hydrogen bomb. After the outburst, the fueling cycle begins again.

This outburst ejects geyser-like filaments shooting out from the core, forming weird loops and trails as the plasma emerges in streamers. The plasma is twisted by the force of the explosion and channeled upwards and outwards by strong magnetic fields. The outflow appears to bend back on itself into a spiral pattern. The plasma is shooting into space over 1 million miles per hour – fast enough to travel from Earth to the Moon in 15 minutes! The filaments are glowing in visible light because they are energized by blistering radiation from the stellar duo.

ISS Crew-8 Will be Back on Earth Friday

Posted on by onespaceman2000
Image (Credit): SpaceX Dragon capsule docked to the ISS. (NASA)

The International Space Station’s (ISS) Crew-8 has departed the station.

NASA astronauts Matt Dominick, Mike Barratt, and Jeanette Epps, as well as Roscosmos cosmonaut Alexander Grebenkin, undocked from the station today at 5:05 PM ET.

They are now traveling towards Earth in a Dragon capsule and should be back on solid ground Friday morning.

Everyone is happy that the hurricanes are gone and NASA can return to normal operations – for now. Hurricane season officially ends November 30, so the weather folks will remain on the lookout.

In the meantime, we wish Crew-8 a safe landing on Friday.

Television: Will We See a Murderbot Television Series?

Posted on by onespaceman2000
Credit: Tordotcom

I am a big fan of Martha Wells’ The Murderbot Diaries, having read all seven in the series and looking forward to the eighth. So I was pleased to read late last year that the series will be coming to television.

If you are not familiar with the series, the best way to describe it is the tale of a security “construct” that has escaped its corporate tether and now needs to make its way in a human world. It starts its freedom acting like a petulant teenager more interested in old media adventures than humans, but it finds its way as the series continues, saving plenty of humans along the way from greedy corporations. It is just a fun read.

So in terms of television, Apple TV+ is working on a 10-episode first season, which includes Alexander Skarsgård (Succession) in the title role. Given that the main character, or Murderbot, is technically genderless and not interested in the topic of sex in the stories, I am surprised Skarsgårdis was given this type of role. You can read about some of the other actors in the series here.

Much of the story takes place within Murderbot’s head as it throws out sarcastic comments, so getting this onto the screen should prove interesting. Apple TV+ took great liberties with the Foundation series, but I hope that will not be necessary here.

I have yet to see a premiere date, so we are talking sometime in 2025.

Stay tuned.

Note: Apple TV+ is advertising a separate movie called Murderbot about a female robot gone crazy. You can ignore it.

A Day in Astronomy: The Birth of Ursula Le Guin

Posted on by onespaceman2000

On this day in 1929, Ursula K. Le Guin was born in Berkeley, California. She would gain her masters degree in French only to later become a well known author of many fantasy and science fiction stories, including the Earthsea series and stories set in a Hainish universe of her making. She would go on to win eight Hugo Awards and six Nebula Awards.

Her style was different from many other authors of her period, focusing more on planetary culture than spacecraft hardware. When asked about her style, she stated the following:

The “hard”–science fiction writers dismiss everything except, well, physics, astronomy, and maybe chemistry. Biology, sociology, anthropology—that’s not science to them, that’s soft stuff. They’re not that interested in what human beings do, really. But I am. I draw on the social sciences a great deal. I get a lot of ideas from them, particularly from anthropology. When I create another planet, another world, with a society on it, I try to hint at the complexity of the society I’m creating, instead of just referring to an empire or something like that.

Given that her mother an anthropologist, it is not surprising that she saw a different way of telling story.

Her books represented a unique part of the science fiction genre that has only expanded over time as the writing community has expanded.

If you need an entry point to her work, you cannot go wrong starting with the short story “The Ones Who Walk Away from Omelas.” However, one of my favorite short stories is “The Island of the Immortals,” which you can find here.

I doubt you will be able to stop with one short story.

We Have Moved from Exoplanet to Exomoon

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Image (Credit): An artist’s rendering of a volcanic moon orbiting WASP-49 b. (NASA/ JPL-Caltech)

The search for new exoplanets in our galaxy continues, but now it may include the first exomoon. This was something that was expected to occur at some point as the detection methods became better over time.

The exomoon in question is believed to be a volcanic moon orbiting a giant planet about 635 light-years away. Detected using the European Southern Observatory’s Very Large Telescope in Chile, the exomoon is discussed in a paper written by researchers with NASA’s Jet Propulsion Laboratory and Caltech in California. The clue was a cloud of sodium that did not appear to come from the host exoplanet.

The new discovery is being compared to Jupiter’s volcanic moon Io, which is the most volcanically active world in the solar system.

If you want to learn more about exomoons, I recommend a Cool Worlds video narrated by Assistant Professor of Astronomy David Kipping who provides five reasons that the study of exomoons is so important.