2019 viewer release summaries week #32

Logos representative only and should not be seen as an endorsement / preference / recommendation

Updates for the week ending Sunday, August 11th

This summary is generally published every Monday, and is a list of SL viewer / client releases (official and TPV) made during the previous week. When reading it, please note:

  • It is based on my Current Viewer Releases Page, a list of all Second Life viewers and clients that are in popular use (and of which I am aware), and which are recognised as adhering to the TPV Policy. This page includes comprehensive links to download pages, blog notes, release notes, etc., as well as links to any / all reviews of specific viewers / clients made within this blog.
  • By its nature, this summary presented here will always be in arrears, please refer to the Current Viewer Release Page for more up-to-date information.
  • Note that for purposes of length, TPV test viewers, preview / beta viewers / nightly builds are generally not recorded in these summaries.

Official LL Viewers

  • Current Release version 6.2.3.527758, formerly the Rainbow RC viewer dated June 5, promoted June 18 – No change.
  • Release channel cohorts:
  • Project viewers:
    • No change.

LL Viewer Resources

Third-party Viewers

V5/V6-style

  • No updates.

V1-style

  • Cool VL Viewer Stable Branch updated to version 1.26.22.56 and Experimental Branch to version 1.26.23.9, both on August 3rd (release notes).

Mobile / Other Clients

  • Radegast updated to  version 2.28 on August 11th (release notes).

Additional TPV Resources

Related Links

Advertisements

Truth at Artful Expressions in Second Life

Artful Expressions: Anu Papp

Artful Expressions Gallery curated by Sorcha Tyles, has (another) new home, and with it, a new exhibition.

Veritas (“truth”) is a selection of images by Anu Papp split into two groups of fives images apiece in the gallery’s two exhibition wings. Avatar studies all, the majority appear to be a mix of self-portraits and images that feature Anu’s SL partner Ferdinand, with around three photos of friends rounding out the mix.

Each of the images has its own sense of mood and presence, which can be added to by hovering the mouse over each in turn to see the title displayed. In this, I found the title of the exhibit somewhat intriguing. While each of the images offers its own narrative (and insight into mood, the possible creative intent), etc., there is little that intrinsically link the images back to the ideal of truth.

Artful Expressions: Anu Papp

This actually offers a possible conundrum, as it leaves those so minded (like myself) to ponder over title and subject. Is the title a reference to the truth that however hard we try to insist “SL is SL and RL is RL and never the twain shall meet”, we actually cannot avoid imbuing our avatars with some (or all) of the traits and foibles of our personalities? Is it the truth that our avatars present the means for each of us to express our inner self to the world more openly and as we would like to be seen by others?

Determining what truth is being referred to can have darker shades, such as the idea is there in truth no beauty? For truth is harsh to almost everyone; it forces us to accept our flaws and snap out of our grand illusions – and our avatars are perhaps one of our grandest illusions. So beautiful they may be – but do that reflect truth? But what then of the individual titles of the pieces presented? Do they fall into place with the idea that in truth, our digital presence is mere illusion, or do they push back against it, revealing that other truth referenced above: that they actually reveal who we are, more so that all of the masks we might otherwise wear in life?

Artful Expressions: Anu Papp

Not that this exhibition demands we engage in such an internal debate. The images are captivating in and of themselves – and I admit to becoming very drawn to the two period pieces offered. Both are marvellously presented, and the case of Les Nobles in particular, I once again saw the greatest truth Second Life offers to us: that no matter who or where we are in life, SL gives our imaginations wings.

SLurl Details

Space Sunday: Curiosity, tardigrades, water and meteors

June 2011: a pristine assembled MSL Curiosity rover sits within its assembly clean room at NASA’s Jet Propulsion Laboratory prior to being stowed and mounted within its delivery system in preparation for its December 2011 launch to Mars. Credit: NASA/JPL

Seven years ago on August 6th, 2012 at 05:17 UTC, NASA’s Mars Science Laboratory rover Curiosity arrived in Gale Crater on Mars. I’ve covered the progress of the mission throughout (just follow my MSL / Curiosity tag), and those articles in fact gave birth to this Space Sunday column; but it’s been a while since I’ve last updated on things.

Since its arrival on Mars, Curiosity has driven a total of 21 km (13 mi) from its landing point to the base of the crater’s central mound, Aeolis Mons, and has ascended 368 metres (1,207 ft) up the side of the mound, which NASA informally call “Mount Sharp” to its current location.

How Curiosity Reached Mars, (1) cruise stage – provided power and data collection during flight from Earth to Mars; (2) aeroshell protecting rover and skycrane during journey and during entry into the Martian atmosphere, with parachute system (6); (3) the skycrane used to winch the rover down to the ground whilst hovering a few metres in the air; (4) the rover in its stowed configuration; (5) the heat shield that protected the vehicle during its entry into the Martian atmosphere. Credit: NASA/JPL

Along the way, Curiosity has revealed a lot about Mars – including confirmation that Gale Crater has been host to multiple bodies of water during its early life, and that the conditions were suitable for microbial life to have potentially arisen on the planet.

Nor did the rover have to wait to make the discovery: it did so literally within weeks of its hair-raising arrival when it had barely started on its journey and was exploring an ancient riverbed on the floor of Gale Crater (dubbed “Yellowknife Bay”), when analysis of samples gathered revealed all the essential ingredients which – if mixed with water (that once flowed through the riverbed)  – might have given life a kick-start and to have been enough to possibly sustain it during the warmer, wet periods of Mars’ early history.

As well as this, Curiosity has revealed much about the ancient conditions on Mars, has found hematite (which requires the presence of water to form), done much to reveal atmospheric processes at work on the planet, and helped track Martian weather and climate processes.

There have been a few causes for concern along the way. Early on in the mission it was revealed that the rover’s six aluminium wheels had suffered more wear and tear than had been anticipated, prompting some changes to the rover’s route as it approached “Mount Sharp”.

Most particularly, the rover’s drill mechanism has had its share of issues, some of which have required changes to how the drill is operated.

However, none of this has really impacted on the rover’s mission – in fact, Curiosity has recently obtained its 22nd drill sample from Mars, as it examines a region the mission team call the “Clay Unit”, one of several closely packed areas with strong differentiators scientists want to examine. Clay forms in the presence of water, and the area has sufficient enough clay deposits to be detected from orbit, and Curiosity has recovered samples with the highest amounts of clay minerals found to date by the mission.

This area is one of the reasons we came to Gale Crater. We’ve been studying orbiter images of this area for 10 years, and we’re finally able to take a look up close.

– Kristen Bennett, U.S. Geological Survey and co-lead for Curiosity’s clay-unit campaign

A panoramic view of “Teal Ridge” in the “Clay Unit” showing sharp differentiations in rock and surface material that suggest the evolution of a lake-like environment. June 18, 2019, the 2,440th Martian day, or sol, of the mission. Credit NASA/JPL

Quite why this particular area is so rich in clay deposits is unclear, but the area is home to complex geologic features, such as “Teal Ridge” and “Strathdon,” a rock made of dozens of sediment layers that have hardened into a brittle, wavy heap. Unlike the thin, flat layers associated with lake sediments Curiosity has studied, these wavy layers in these features suggest a more dynamic environment. Wind, flowing water or both could have shaped this area.

Both “Teal Ridge” and “Strathdon” represent changes in the landscape suggestive of the evolution of the ancient lake environment. This is further exemplified by the area above the “Clay Unit”, and towards which Curiosity is slowly making its way. It’s an area rich is sulphate deposits, indicative that it was drying up or becoming more acidic in ancient times whilst the lower slopes were still rich in water.

The Clay and Sulphate bearing regions on “Mount Sharp” and the proposed path Curiosity is following through them. Credit: NASA/JPL

Cutting down slope through the “Sulphate Unit” is the Gediz Vallis and Ridge, which appears to have been form by water running down “Mount Sharp” at some period after both the Clay Unit and Sulphate Units before spreading into the “Greenheugh Pediment”. This points to the area having seen some considerable changes as a result of climate changes on Mars.

We’re seeing an evolution in the ancient lake environment recorded in these rocks. It wasn’t just a static lake. It’s helping us move from a simplistic view of Mars going from wet to dry. Instead of a linear process, the history of water was more complicated. It’s finally being able to read the paragraphs in a book — a dense book, with pages torn out, but a fascinating tale to piece together.

– Valerie Fox, Division of Geological and Planetary Sciences, Caltech

Curiosity is powered by a radioisotope thermoelectric generator (RTG) that uses a core of plutonium-238. The heat given off by the decay of the isotope is converted into electric voltage by thermocouples and stored within two lithium-ion batteries that directly power the rover’s systems. This ensures the rover obtains constant power during all seasons and through the day and night, with waste heat is also passed through the vehicle’s interior to keep systems and instruments at their operating temperature and without the need for additional electric heating systems.

However, over time, the amount of electrical voltage the RTG can generate decreases. Overall, Curiosity’s RTG is expected to provide sufficient power (100+ Watts) to run all of the rover’s systems for 14 years – so 2019 marks the half-way point. Which is not to say that Curiosity only has seven more years of operations. Rather, it means that in around 7 years power generation is going to fall below the 100 watts mark, and it may become necessary for rationing power between systems on the rover, reducing some of its capacity.

Taridgrades on the Moon?

I’ve previously written about the Israeli attempt to land a vehicle – called Beresheet – on the Moon (see Space Sunday: Mars, the Moon and space hotels and Space Sunday: tourist flights, landers, moons and rovers). Unfortunately, the mission didn’t go as planned, and the lander crashed into the Moon (see Space Sunday: black holes, Falcons and moonshots). However, one of the more curious aspects of the mission is part of the payload.

The mission included the first stage of a privately-funded initiative to transfer living DNA to the Moon – a kind of “Noah’s Ark Mark II”, providing a repository from which plants and animals could be regenerated to repopulate the Earth should a catastrophe akin to a flood of biblical proportions overtake the planet. In particular for this first phases of the project, a 30-million-page archive of human history viewable under microscopes, as well as human DNA were carried by the lander in a DVD-like “Lunar Library” – which also includes tardigrades.

The tardigrade. Credit: 3DStock/Shutterstock

Science fiction fans might recognise this name from the television series Star Trek: Discovery. However, far from being the stuff of sci-fi shows and stories, tardigrades are very real (if a lot, lot smaller than their Star Trek “breathren”) and also exceptionally hardy.

Known colloquially as water bears or moss piglets, tardigrades are a phylum of water-dwelling eight-legged segmented micro-animals that can be found almost anywhere on Earth, from the tops of mountains to the bottoms of the oceans, from the tropical stew of rain forests to the frozen wastes of the polar regions. They can survive extremes of temperature and pressure (both high and low), air deprivation, radiation, dehydration, and starvation and exposure to outer space.

The tardigrades were stored dehydrated tardigrade – which puts them into a state of suspended animation – and “encased in an epoxy of Artificial Amber”. In this state, they could in theory be revived if exposed to heat and moisture. But even without these, the tardigrade could survive for years on the Moon – specimens have been recovered after being in a dehydrated state for decades. Such is the design of the unit in which they are stored, those responsible for the project believe it “highly likely” it survived Beresheet’s impact on the surface of the Moon.

Sadly, it is unlikely we’ll ever get to know if this is the case; the crash point for the Israeli lander puts in it in an area of the Moon’s south polar region far removed from any planned destinations for NASA’s Artemis missions, making recovery very unlikely.

Steam Powered Satellites and Autonomous Exploration

Am August press release from NASA reveals the agency has completed tests of what is effectively the world’s first steam-propelled satellite in Earth’s orbit. Admittedly, it not a particularly big vehicle being tested – it is small enough to compete with a box of tissues – but the test is an important step in examining technologies for future automated space exploration.

The test took place on June 21st, 2019, and was part of a coordinated manoeuvre between two CubeSats operating in low-Earth orbit, carried out as part of NASA’s Optical Communications and Sensor Demonstration (OCSD) mission.

The steam-propelled CubeSat in an artist’s impression. Credit: NASA

The two tiny vehicles were orbiting the Earth around 9 km (5.8 mi) apart when they automatically established a radio communications cross-link with one another. One then ordered the other to fire its thruster and close the gap between them. Rather than using a traditional hypergolic propellant or inert gas, both of the CubeSats carry small tanks of water which can be heated to produce steam that is ejected through an engine nozzle to generate propulsion.

This demonstration is important on two counts. The first is that it shows the potential for a series of small satellite drones to command one another to carry out assorted operations entirely independently of control from Earth. Such a group of drones could work cooperatively on a mission – say a survey of the asteroid belt or the icy moons of Jupiter. They could operate in unison, commanding one another, or under the autonomous control of a “mother ship” that could have facilities for storing (and returning) samples to Earth.

The second is that, in using water as a means of propulsion, these vehicles could in theory be easily fuelled and refuelled with water – water which might in turn be obtained from the frozen bodies these craft are exploring.

Demonstrations such as this will help advance technologies that will allow for greater and more extended use of small spacecraft in and beyond Earth-orbit. It is exciting to think about the possibilities enabled with respect to deep space, autonomously organizing swarms of small spacecraft.

– Roger Hunter, programme manager,
NASA Small Spacecraft Technology Programme

Perseid Meteor Shower

Every July / August, the Earth passes through a haze of stellar debris left by Comet 109P/Swift-Tuttle. The result is of this passage is the Perseid meteor shower (called this because they appear to originate from the constellation of Perseus), is one of the brightest meteor displays one can see in the northern hemisphere. The shower tends to last around a month, from July 17th (ish) through to August 24th.

Observing the Perseids in 2019

This year, the peak period for activity should be August 12th and 13th, when between 60 and 100 meteors an hour might be visible streaking across the night sky. In Europe, the best time to see them is after midnight, while America gets it a little easier and earlier. To check time in your location try timeanddate.com, which should give local observation times.

Unfortunately, the moon will be very close to full on the night of the peak, and this will affect the visibility of the fainter meteors. Of course, you’ll also need to be somewhere that’s dark enough to see the night sky without it being blotted too heavily by surrounding Earthly light pollution.

To help people observe the peak period, there are a number of planned livestreams on the web – including the two below.