DaveC426913's latest activity

I have every Larry Niven book ever written. :wink: Alas, there appears to be a paucity of neutron stars with smoke rings in our Solar...

(Just for fun, I ran it through ChatGPT. I don't trust it but why not?) It suggests - factoring in drag - the flyer would hit the...

Say we have a hollow asteroid colony, spun up to provide gravity. The residents would be unable to resist making wings and flapping...

Full disclosure- I include this image with my 'Intro to Biological Physics' course materials because it's such a good resource. My...

Yeah. I looked it up. It's most popular application is on maps or globes. It is famously found on two known globes: the Hunt-Lenox Globe...

Yes and no. Having investigated the possibilities previously, the first "vacuum airship" will actually be a reduced-pressure, a...

Aerographene is much much lighter than air. Of course, it's not impervious so it is filled with air rather than vacuum, which is why it...

Thank you. Thought my world was a lie. Shouldn't it float? Oh. No. Because it isnt filled with vacuum. Duh.

0.095 g/cm³ is perhaps a typo, that should read 0.0095 lbs/ft³. 0.0095 lbs/ft³= 0.152 kg/m³ = 152.2 g/m³. The lowest density solid foam...

Yeah. Huh I thought this stuff was light as air. A three foot cube that's too heavy to lift doesnt seem remarkably light. Even...

It says density is .095g/cm3. That means a one cubic metre of it (the size of a dishwasher) would mass 95kg. i.e. as much as a large...

Star Trek used a variant.

I confess, I run things through ChatGPT for inspiration and for a different perspective. My book contains a disclosure that I use AI for...

Good point. It needs to be formatted as a PDF to publish. You could just read the PDF.

I must admit to having been so pushy that I actually got a sneak preview. Although where I found the reckless pushy courage to ask for...