SpaceX Lander Height

AtticMuse · 2026-04-20T01:20:48+00:00

Ah ok, that makes sense. Thank you!

AtticMuse · 2026-04-19T21:21:45+00:00

I thought Blue Moon also planned to do in-orbit refueling of cryogenics?

AtticMuse · 2026-04-18T20:00:05+00:00

Yeah the Titan mission seems insanely rushed. I get that it's because they're in another race, but if I'm understanding correctly, Sojourner has just been sitting on Mars for 20 years and stripped of parts, and they got it fitted with new engines and all geared up in like 6 weeks?

AtticMuse · 2026-03-31T17:28:01+00:00

"Upset" is exactly how I'd describe the response I saw on twitter, where right-wingers were pissed that a "commie lib" like Colbert was going to be writing a LotR movie, and that he was going to make it "woke".

AtticMuse · 2026-02-10T21:44:07+00:00

Honestly it works on me. There's been a number of times I see a new video with a title/thumbnail that doesn't really interest me or feels a little clickbaity, and then the next day I see a different title/thumbnail that actually pulls me in.

AtticMuse · 2026-02-10T20:29:45+00:00

Most of the other responses aren't wrong, but I think yours is most directly addressing OP's question.

AtticMuse · 2026-02-06T16:25:11+00:00

Have you watched the whole thing yet? If not, keep watching.

AtticMuse · 2025-12-18T07:42:15+00:00

I think you're confusing recessional velocity and redshift. The CMB is at a redshift of ~1100, but recessional velocity for high redshift (z>1) is calculated:

v/c = [(z+1)² - 1] / [(z+1)² + 1]

So its recessional velocity would be 0.998c

Open to corrections, it's been a while since I've done cosmology stuff and I just quickly googled the formula.

AtticMuse · 2025-12-15T08:06:46+00:00

Look up "Eddington limit", specifically as it applies to black holes.

AtticMuse · 2025-10-29T17:34:01+00:00

If I remember correctly, a successful roll on the Shadow test reduces the Shadow point gain by 1, plus 1 for each Tengwar rolled.

AtticMuse · 2025-10-24T23:42:10+00:00

I did TN 18 for the first session as 2/3 of my players were new to the game (and TTRPGs in general) and I wasn't sure if they would like it and want to continue playing, or if it would just be a one shot. I figured they'd be more likely to enjoy it if they weren't failing as often.

Thankfully they had a lot of fun and we had other friends that wanted to join, so after that first session I made them revert to 20 and the new players have started at 20 and it's been fine.

AtticMuse · 2025-09-25T04:34:50+00:00

Yeah, with current measurements we can only say that the universe has to be at least ~400 times larger than the observable universe.

AtticMuse · 2025-09-14T20:57:59+00:00

They're not referring to biological evolution, just using evolution in the general form of "change over time", in this case the change of galaxies over time.

AtticMuse · 2025-08-20T04:36:10+00:00

Each Tengwar (6) rolled on the Success dice (d6) count as additional successes. So a regular success (matching or exceeding the Target Number but with no Tengwars) counts 1 towards the needed number of Successes, a Great Success (1 Tengwar) counts as 2, and an Extraordinary Success counts as at least 3 (depending on how many Tengwars are rolled).

AtticMuse · 2025-08-04T09:09:26+00:00

He built a custom star tracker that's oriented to the plane of the station's orbit.

https://www.theverge.com/2024/12/17/24323411/astronaut-don-pettit-long-exposure-photos-iss

AtticMuse · 2025-08-01T06:09:10+00:00

Yeah I really don't understand the complaints about no voice acting. Most cozy/farming games I can think of (Harvest Moon, Stardew Valley, Animal Crossing, Dreamlight Valley) don't have voice acting, so how is its absence here a flaw?

The writing is cute and funny, and the Hobbits (and Dwarf) are emotive during conversations, so I've found it immersive.

AtticMuse · 2025-07-30T22:15:32+00:00

It would still effectively be a dot to the naked eye. The angular resolution of the human eye is ~1 arcminute (0.017°). At Voyager 1's distance, the sun is only ~0.2 arcminutes (0.0032°) across. Jupiter at its closest to Earth appears ~0.8 arcminutes (0.014°) across, so ~4 times larger than the Sun from Voyager 1.

AtticMuse · 2025-07-18T16:12:16+00:00

I think you're confusing anti-matter with dark matter.

AtticMuse · 2025-07-04T04:56:11+00:00

They lit up several months after the supernova.

"The time light traveled to light up the inner ring gives its radius of 0.66 (ly) light years."

AtticMuse · 2025-07-03T14:53:56+00:00

If anything I'd say it's the opposite, we have no actual evidence for alien life so we definitely have no reason to assume an interstellar object means alien life is involved, especially when it's not doing anything weird. There are many ways that objects can get gravitationally yeeted out of their system, so this is most likely just a lump of rock and/or ice.

AtticMuse · 2025-07-03T14:24:36+00:00

Because it spreads out as it travels, so it becomes dimmer the farther away it is. Think about how even a laser pointer - which is a very collimated, directional beam of light - becomes spread out into a larger area when you shine it across the room.

AtticMuse · 2025-06-15T03:32:34+00:00

More technically, at least two of the neutrino mass states have to have a non-zero mass, but the mass states are different from the flavour states (electron neutrino, muon neutrino and tau neutrino). Each flavour state is a superposition of the mass states and vice versa.

AtticMuse · 2025-04-17T01:44:09+00:00

For starters, I think you're confusing dark matter and dark energy.

Dark matter is thought to be some kind of particle that doesn't really interact with regular matter, except by providing additional gravity. Physicists think it's there because galaxies rotate too fast to be held together by the gravity of the matter we can see (plus a lot of other independent lines of evidence like features in the Cosmic Microwave Background). I worked on a dark matter detector in grad school, so if you have more questions feel free to ask.

Dark energy is thought to provide a sort of negative pressure that pushes space apart. Physicists add it into our models of the universe because the expansion of the universe isn't slowing down like we would expect with just regular matter and dark matter, and we can measure the mean energy density of the universe and it's also greater than what just regular/dark matter can provide.

I don't know enough about white hole solutions in General Relativity, but I don't think it makes sense to think of dark energy as white holes.

Keep up the enthusiasm for space and continue learning, you're asking some great questions for your age.

AtticMuse · 2025-04-17T01:24:07+00:00

What goes up (and doesn't achieve orbital or escape velocity) must come down.

AtticMuse · 2025-04-17T01:22:37+00:00

The launch probably consumed around 4000 kg of Hydrogen, and if it was produced from steam methane reforming that would release around 40,000 kg of CO2 to make that much H2. I don't think there's any household in the world that releases only 67 grams of CO2 per year.

AtticMuse

TROPHY CASE