Category: Points of Information

Very brief descriptions, with appropriate links, of current or recent news items.

Spectacular 2,300-year-old wall mosaic found in archaeological dig in Rome

8:33 pm

Archaeologists have uncovered a 2,300-year-old wall mosaic in almost perfect condition in Rome that had been part of a banquet room overlooking a garden.

Estimated to be around 2,300 years old, the work is part of a larger aristocratic mansion, located near the Roman Forum, that has been under excavation since 2018. Almost five meters long (16.4 ft) and featuring depictions of vines, lotus leaves, tridents, trumpets, helmets and mythological marine creatures, the mosaic scene was painstakingly created using mother of pearl, shells, corals, shards of precious glass and flecks of marble. The piece is framed by polychrome crystals, spongy travertine, and exotic, ancient Egyptian blue tiles.

What makes this discovery “unmatched,” said archaeologist Alfonsina Russo, head of the Colosseum Archaeological Park in charge of the site, is not only the incredible conservation of the mosaic, but its decoration which also features celebratory scenes of naval and land battles likely funded — and won — by an extremely wealthy aristocratic patron who commemorated the victories on their walls.

Though it is believed such tiled mosaics were common in the homes of wealthy Roman aristocrats, most have not survived in good condition, making this discovery significant as well as beautiful. In addition, the location of the house and the details within the mosaic could make it possible to actually identify the Roman who lived here, which in itself would be a major historical find.

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December 21, 2023 Quick space links

3:24 pm

Courtesy of BtB’s stringer Jay.

 

 

 

  • The launch of Apollo 8 at 7:51 am December 21, 1968

    • The footage is only 18 seconds long, covering the final countdown and liftoff. For a full history go here. Frank Borman, Jim Lovell, and Bill Anders would go on to circle the Moon for 20 hours, read from the Old Testament on Christmas eve, and essentially win the 1960s space race for the free world.

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A glacial lake on Mars?

12:40 pm

A glacial lake in a
Click for original image.

Cool image time! The picture to the right, rotated, cropped, reduced, and sharpened to post here, was taken on August 30, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO).

It shows what appears to be a glacial flow of ice, flowing downhill to the southwest and inside a wide canyon about three miles across. The canyon rims to the north and south are about 2,000 to 2,100 feet above the canyon’s lowest point, indicated by the string of “+” signs.

This close-up view immediately suggests a canyon whose glacier flows outward to the southwest into open lowland terrain, though the three craters, because they are undistorted, suggests that this flow is presently not active. That suggestion however would be wrong. It is always necessary to understand Martian geology to not only take close-in views at high resolution, but to zoom back and see the terrain in context.
» Read more

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New Hubble image of Saturn

10:04 am

Saturn and its rings, as seen by Hubble

The annotated image above was taken by the Hubble Space Telescope on October 22, 2023, showing Saturn, its glorious rings, and several of its dozens of moons from a distance of about 850 million miles. For the unannotated version, go here. Of all the features, the spokes in the rings are the most intriguing.

Saturn’s spokes are transient features that rotate along with the rings. Their ghostly appearance only persists for two or three rotations around Saturn. During active periods, freshly-formed spokes continuously add to the pattern. In 1981, NASA’s Voyager 2 first photographed the ring spokes. Hubble continues observing Saturn annually as the spokes come and go. This cycle has been captured by Hubble’s Outer Planets Atmospheres Legacy (OPAL) program that began nearly a decade ago to annually monitor weather changes on all four gas-giant outer planets.

Hubble’s crisp images show that the frequency of spoke apparitions is seasonally driven, first appearing in OPAL data in 2021 but only on the morning (left) side of the rings. Long-term monitoring shows that both the number and contrast of the spokes vary with Saturn’s seasons. Saturn is tilted on its axis like Earth and has seasons lasting approximately seven years.

This year, these ephemeral structures appear on both sides of the planet simultaneously as they spin around the giant world. Although they look small compared with Saturn, their length and width can stretch longer than Earth’s diameter!

Though the origin of the spokes remains unsolved, the leading theory proposes they are caused by interactions between Saturn’s magnetic field and the seasonal changes in solar radiation.

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Ingenuity’s engineers explain what they have learned flying the helicopter on Mars

9:49 am

Link here. The essay details carefully the problems they have faced, and how they have not only overcome them but used them to refine operations to squeeze far more capabilities out of the helicopter, beyond its initial design.

Saving flight time saves energy, reduces heating, and provides more freedom to use slower speeds to tiptoe around disruptive terrain that might otherwise endanger or significantly degrade the landing accuracy of the helicopter. Higher speeds and higher accelerations reduce the time needed to execute a given flight path. Higher altitudes permit higher speeds, as the wider field of view helps to keep ground features in view of Ingenuity’s navigation camera longer, counteracting the effect of increased speed. Expanding Ingenuity’s flight envelope had the potential to relax flight planning constraints and allow Ingenuity to operate more effectively alongside Perseverance.

As a result, beginning with flight 45 the team has made changes to increase flight speeds and acceleration at every point of every flight, thus allowing the helicopter to fly higher and farther with less strain.

This report however does not provide any information on Ingenuity’s last two flights, especially its 68th, which did not go as planned. The helicopter appears to be in good shape (the team has already planned the 69th flight, which was supposed to happen two days ago), but a more detailed update would be appreciated.

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ULA’s Vulcan rocket fully stacked for the first time

9:39 am

Peregrine landing site
The landing site for Astrobotic’s Peregrine lunar lander

In preparation for its targeted January 8, 2024 launch, ULA’s Vulcan rocket has now been fully stacked for first time in its assembly building at Cape Canaveral.

ULA’s new rocket has rolled between its vertical hangar and the launch pad at Cape Canaveral Space Force Station several times for countdown rehearsals and fueling tests. But ULA only needed the Vulcan rocket’s first stage and upper stage to complete those tests. The addition of the payload shroud Wednesday marked the first time ULA has fully stacked a Vulcan rocket, standing some 202 feet (61.6 meters) tall, still surrounded by scaffolding and work platforms inside its assembly building.

It will next be rolled to the launchpad for some final checks prior to launch on January 8, 2023. Unlike most first launches, it carries a real payload, Astrobotic’s Peregrine lunar lander, which hopes to softly place several NASA and commercial payloads near the Gruithuisen Domes in the northwest quadrant of the Moon’s visible hemisphere, as shown on the map above.

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White House issues “policy framework” to lobby for its space regulatory proposal

9:28 am

Faced with stiff opposition from industry and politicians from both parties in Congress to its regulatory proposal issued in mid-November, the White House yesterday released what it called a “policy framework” for implementing that proposal.

You can read this policy framework here [pdf]. It is filled with high-sounding claims about its goal is to encourage private development and reduce red tape, but in the end it only adds more government entities to the entire bureaucracy that regulates commercial space. From the framework itself:

The Secretaries of Commerce and Transportation will co-lead a Private Sector Space Activities Interagency Steering Group in consultation with the Chairperson of the Federal Communications Commission (FCC), comprising representation from the Departments of Defense, Energy, Homeland Security, Interior, and State, the National Aeronautics and Space Administration (NASA), the Office of the Director of National Intelligence, the Office of Science and Technology Policy, and any other Federal entities with expertise or equities pertaining to private sector novel space activities, including relevant stakeholders from the Executive Office of the President. The Steering Group serves as a coordinating body to ensure that the U.S. Government oversight system is prepared to meet U.S. priorities while taking into consideration the competitiveness of U.S. industry now and into the future.

One of the criticisms of the White House proposal from mid-November was that it would split regulation between Commerce and Transportation, thus increasing the complexity for commerical companies. This steering group is clearly an effort to answer those complaints, but based on this proposal, it simply adds one more bureaucratic layer to the mix, making things even more complicated.

The framework also calls for the expansion of the government’s regulatory footprint on several fronts, such as controlling orbital debris, and achieved through “expanding existing, or establish new, federal advisory committees to account for all expanded space authorities in furtherance of this Framework and related legislative proposals.”

From the viewpoint of freedom, this entire proposal reads like a zombie end-of-the-world horror film, with bureaucratic zombies appearing endlessly from all directions, aimed at consuming any independent private company as quickly and as thoroughly as possible.

The original commercial space act proposal from Congress, that the Biden administration (and most Democrats) oppose but carries the endorsement of the private commercial space industry, was passed by its House committee, but still needs to be voted on by the full House, as well as the Senate. Because it remains in limbo, the White House has issued this framework, in the hope it can give its side the ammunition needed to defeat that bill and replace it with the White House’s.

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A movie of 14 years of gamma ray observations from space

8:49 am

Link here. I have also embedded the movie below. The movie was made from fourteen years of observations by the Fermi Gamma-Ray Telescope in orbit around the Earth. From the press release:

Gamma rays are the highest-energy form of light. The movie shows the intensity of gamma rays with energies above 200 million electron volts detected by Fermi’s Large Area Telescope (LAT) between August 2008 and August 2022. For comparison, visible light has energies between 2 and 3 electron volts. Brighter colors mark the locations of more intense gamma-ray sources.

“One of the first things to strike your eye in the movie is a source that steadily arcs across the screen. That’s our Sun, whose apparent movement reflects Earth’s yearly orbital motion around it,” said Fermi Deputy Project Scientist Judy Racusin, who narrates a tour of the movie, at NASA’s Goddard Space Flight Center in Greenbelt, Maryland.

Most of the time, the LAT detects the Sun faintly due to the impact of accelerated particles called cosmic rays – atomic nuclei traveling close to the speed of light. When they strike the Sun’s gas or even the light it emits, gamma rays result. At times, though, the Sun suddenly brightens with powerful eruptions called solar flares, which can briefly make our star one of the sky’s brightest gamma-ray sources.

The movie shows the sky in two different views. The rectangular view shows the entire sky with the center of our galaxy in the middle. This highlights the central plane of the Milky Way, which glows in gamma rays produced from cosmic rays striking interstellar gas and starlight. It’s also flecked with many other sources, including neutron stars and supernova remnants. Above and below this central band, we’re looking out of our galaxy and into the wider universe, peppered with bright, rapidly changing sources.

Most of these are actually distant galaxies, and they’re better seen in a different view centered on our galaxy’s north and south poles. Each of these galaxies, called blazars, hosts a central black hole with a mass of a million or more Suns.

Fermi is essentially mapping the high energy objects of the entire universe.
» Read more

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Russia launches military satellite

8:37 am

Russia early this morning successfully launched a classified military satellite, its Soyuz-2 rocket lifting off from its Plesetsk spaceport in northern Russia.

No word on where the rocket’s strap-on boosters or first stage crashed within Russia.

The leaders in the 2023 launch race:

92 SpaceX
61 China
18 Russia
8 Rocket Lab
7 India

American private enterprise still leads China in successful launches 105 to 61, and the entire world combined 105 to 97. SpaceX by itself now trails the rest of the world (excluding other American companies) 92 to 97.

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Starship prototype #28 completes full duration static fire test

8:49 pm

Gearing up for Starship/Superheavy orbital test flight #3: Starship prototype #28 today successfully completed a full duration static fire test, with all six engines firing for about five seconds.

The link goes to SpaceX’s X feed, and shows that test.

This is more evidence that SpaceX intends to be ready in all ways to do that third orbital test flight of Superheavy/Starship by mid-January, at the latest. It also suggests the company is getting close to finishing its investigation into the previous test flight in mid-November.

Of course, none of this means it will launch in mid-January. I predict SpaceX will be stuck twiddling its thumbs waiting for a launch license from the FAA, which will also be waiting for an okay from Fish & Wildlife. Both will likely be forced to work as slowly as possible, likely because of interference from the White House.

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Glacial layers in Mars’ glacier country

2:40 pm

Glacial layers in Mars' glacier country
Click for original image.

Cool image time! The picture to the right, cropped, reduced, and sharpened to post here, was taken on August 20, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It features a 250-foot-high north-south cliff that appears to have numerous horizontal layers within it.

Moreover, both on the plateau above the cliff as well as the floor below it, the entire surface seems to resemble a thick snow/ice field, made even more evident by the distortion of many craters and the apparent glacial material inside each crater.

The layers suggest that this ice was laid down in a series of cycles. During cold periods snow fell and accumulated as ice over time. When things became warmer some of that ice sublimated away, but not all. With the next cold cycle a new layer was put down.

The many layers suggest many climate cycles on Mars, none of which were caused by SUVs or coal-firing electrical power stations.
» Read more

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