M Thomas Apple Author Page

Science fiction, actual science, history, and personal ranting about life, the universe, and everything

Mars has a really thick skin

July 28, 2021
MThomas

Well, OK, technically it’s the mantle, not the crust.

But it is thick. Super thick. And no gradations like the Earth.

Extrapolating to the known surface geology of the rest of the planet, this suggests an average thickness of between 24km and 72km. By contrast, Earth’s average crustal thickness is 15-20km.

https://www.bbc.com/news/science-environment-57935742

So what does this mean?

For one thing, it probably explains why there’s no breathable atmosphere on Mars.

Mars never developed a global magnetic field to block solar radiation. So it’s atmosphere was basically ripped right off.

And any terraforming attempts in the future would fail on a global scale. But maybe locally it might work…

Destination: Red Planet

June 27, 2021
MThomas

Like other nations, China “regards Mars exploration as the preferred destination for deep space exploration,” Wang said.

https://abcnews.go.com/amp/Technology/china-unveils-ambitious-roadmap-human-mars-exploration/

China’s plan calls for setting up a permanently occupied base and a fleet of interplanetary craft. Probably it’s a good idea to first see whether it can meet its goal of landing people on Mars in 2033.

Of course, China is “willing to join hands with our counterparts and partners all over the world,” but it’s unlikely NASA, JAXA, ESA, and the UAE and other countries not named Russia will “cooperate.”

The next space race is here. Just wait until multinats actually decide asteroid mining is worth the risk and expense.

Squids…In…Space….!

June 6, 2021
MThomas

OK, yeah, squid doesn’t have a plural, but come on, can’t you just hear “Miss Squiddy”? 🦑 (Reference lost on younger viewers.)

The 128 baby bobtail squid will be used as part of research into the effects of spaceflight on beneficial interactions between microbes and animals.

https://www.bbc.com/news/science-environment-57339989

So why use squid instead of dogs, chimps, or other mammals?

The squid have an immune system which is similar to that of humans.

Ah.

And their distinct lack of a spine makes them similar to most politicians, too. Very helpful for finding out what might happen if we decide to…

Nah.

“Wright Brothers’ moment” – helicopters on Mars

April 19, 2021
MThomas

“We together flew on Mars. We together have our Wright brothers moment.”

https://www.washingtonpost.com/technology/2021/04/19/nasa-ingenuity-helicopter-mars/

Yeah, yeah, I know. Technically, a German immigrant in Connecticut flew a plane before Orville and Wilbur.

But PR counts. Kudos, NASA!

X-Rays from Uranus!

April 5, 2021
MThomas

Two-ringed and sideways gas giant

The gag practically writes itself…

…but seriously, this is neat. One source of the X-Rays is the Sun (it also bounces off of Jupiter and Saturn). But there may be yet another source…perhaps the rings of Uranus or the planet itself.

And no, it’s not really pink. That’s just a Chandra X-ray image.

Shame, really.

https://www.nasa.gov/mission_pages/chandra/images/first-x-rays-from-uranus-discovered.html

Space elevators, revisited (and even possible)

April 2, 2021
MThomas

“Technical-wise, it’s kind of ready” (Prof. George Zhu of York University)

https://academictimes.com/far-from-science-fiction-space-elevators-may-be-nearing-deployment/?fbclid=IwAR0owexz5xK1IW9ye4FxiocqnrL7DgroSeRaqtgbNwpDVx4RIDVLZSuLWXc

The possibilities…the tether doesn’t actually have to touch the ground. Basically, you put up a satellite with two tethers (one for things going up, one for things going down) and then have a rocket sent up and attach to the tether.

The tether would then push the payload the rest of the way into outer space (as the article points out, space begins at 62 miles above sea level, but 98% of the weight of rockets is used to break away from the Earth’s gravity to that point).

Now, this article was published on April 1st, so I’m really hoping it’s not a prank…

(Also, wordpress looks REALLY BAD today for some reason. Wth? This “block” style is clunky AF and looks more like Netscape ca. 1996)

“Potentially hazardous asteroid” approaching Earth

March 22, 2021
MThomas

This is how I’ll get a photo of 2001 F032 for its next pass in 2052.

Hazardous asteroid!? Call out Bruce Willis!

No worries. “Close to Earth” in this is 1.25 million miles. But it’s a great chance to find out more about the early solar system.

https://www.nbcnews.com/science/space/potentially-hazardous-asteroid-come-closest-earth-sunday-n1261689

Still, they persevered!

February 18, 2021
MThomas

Great job, NASA! Landing on Mars is always a tricky business.

Now all Perseverance has to do is find traces of life, save it without contamination, and then wait for another rocket, another rover, and a satellite to get in orbit so the samples can be sent back to Earth.

Piece of cake, right?

https://www.bbc.com/news/science-environment-56119931

Sorry, Venus is just a lot of gas

February 4, 2021
MThomas

There’s a reason I didn’t post a while ago about the supposed “there’s life in the clouds of Venus” finding.

It was just a big load of gas.

Sorry, folks. Venus is a big rotten egg. 🥚

https://www.nbcnews.com/science/space/signs-life-venus-might-just-be-ordinary-sulfur-gas-n1256739

Magnetic reconnection plasma thruster: Not too fast, not too slow, juuuust right

February 4, 2021
MThomas

A crewed mission to Mars may be more practical thanks to a new rocket concept developed by Fatima Ebrahimi, a physicist at the US Department of Energy’s (DOE) Princeton Plasma Physics Laboratory (PPPL), that uses magnetic fields to generate thrust.

https://newatlas.com/space/magnetic-reconnection-rocket-thruster-concept-spaceflight-mars/

Looks good so far…

…although it’s just a computer simulation right now and the magnetic thruster model hasn’t even been built yet.

Ah, well, just repurpose an existing ion thruster, right?

Hmm. I’m not a rocket scientist, but.. 🚀

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