The coming train wreck for Commercial Human Spaceflight

This post by retired NASA engineer Wayne Hale explains why it probably is a good idea if Congress cuts the subsidies for new commercial space: The coming train wreck for commercial human spaceflight. This is the key quote, where Hale describes the regulations NASA is requiring these new companies to meet:

The document runs a mind-numbing 260 pages of densely spaced requirements. Most disappointing, on pages 7 to 11 is a table of 74 additional requirements documents which must be followed, in whole or in part. Taken all together, there are thousands of requirement statements referenced in this document. And for every one NASA will require a potential commercial space flight provider to document, prove, and verify with massive amounts of paperwork and/or electronic forms.

School Reverses Course After Ordering Student to Remove American Flag From Bike

In a victory for free speech (from a battle that shouldn’t have been fought in the first place), a school has reversed course after ordering a 13-year-old student to remove the American flag from his bicycle because some students said they’d be offended. Key quote:

[School superintendent Edward] Paraz says the school . . . now will be shifting its focus to the students who complained. “In no way did we want to take that right away from Cody,” Paraz told Fox40 on Friday. “…We think we know who the instigators are that were trying to do that and we need to meet with their parents and those students to just kind of explain that this isn’t what we want to have.”

Sinkholes on Mars

Caver alert! Releases this week from both the Mars Express orbiter and the Mars Reconnaissance Orbiter show a variety of sinkholes and collapse features on Mars, which in turn suggest the possibility of underground passages.

First, there is this picture from Mars Express, showing the area called Phoenicis Lacus (Latin for Phoenix Lake).

Phoenicis Lacus

The large and long canyon in box 1 is actually a collapse feature, almost two miles deep and formed as this region was stretched, warped, and cracked by the powerful volcanic activity of the nearby giant volcanoes of the Tharsis plateau, including Olympus Mons, the solar system’s largest volcano. You can also see how this activity causes several sinkholes and craters in all three boxes to become elongated and distorted.

In places where the surface is deformed in this way on Earth, you often find tectonic caves, underground cracks produced as the ground is pulled apart. The large collapse feature suggests the possibility that there are voids below it.

Then there is this subimage from this release of Mars Reconnaissance Orbiter, showing the central peak and southern slope of an old crater in the Terra Sirenum region of the Martian southern hemisphere.

central crater peak

Down that south slope can be seen what look like fluvial-like flows. In the center of these flows as well as near the top of the peak are what appear to be a string of collapse features. Below is the close-up as indicated by the box above:

inset closeup of sinkholes

From the caption: “It is possible that these pits are evidence of subsurface piping or hydrothermal activity. Piping occurs when subsurface water flows through soil, takes some soil with it, and causes the overlying ground to collapse. These fluvial-like features and the connected pits may have formed during a late stage of crater formation when temperatures were suitable for liquid water.”

On Earth, this is one of the geological processes that forms sinkholes on the surface as well as caves underground. When cavers go out to look or dig for new caves, we often head for just this kind of string of sinkholes, as they are excellent evidence that an unentered cave lies hidden below, ripe for exploration.

1 1,032 1,033 1,034 1,035 1,036 1,072