MinimumSky5

All liquid rockets leave a small amount of fuel in discarded stages, to prevent the engines undergoing RUD's when the turbines start sucking air.

Oneweb: We've just launched our first 6 satellites! Musk: Hold my beer.

Dark Energy is what's pushing galaxies away from each other, and it's nothing to do with dark matter. We're fairly certain that it can't be black holes, as we would see significantly more microlensing events if more stellar mass black holes were present, and small Primordial black holes would be detectable from their hawking radiation. Also, we've seen galaxies that have had their dark matter removed somehow, and I'm not sure how a natural process would remove only black holes, without moving anything else in the galaxy.

It's the fact that in most areas of the US, there is only one Internet supplier. Given that I can chose between 6 national suppliers and a few local ones, and I'm not in a particularly big town, it's always struck me as one of the best examples of crony capitalism.

Whenever I hear about LEO Internet constellations, I wonder why they'd be competitive with ground based Internet. Then I remember how ridiculous the Internet is in the US, and it all makes sense again.

We aren't talking about maths, we're talking about quantum superposition. Here's a thought experiment to explain they you cannot simulate a quantum computer using a classical computer. You have a room, which you place into quantum superposition at will, and including all of that rooms contents. You give a friend a phone book and a phone number, and tell them to open to a random page in that book, and see if they can find the owner of that number. If the do find the owner, they are to leave the room and tell you immediately, but if they don't, they should wait in the room for a few minutes. They go into the room, and you put the room into superposition. You can be fair confident that in a few seconds, your friend will re-emerge, telling you who owns the number, because your friends quantum state has collapsed into the one you wanted, as you set that particular state to collapse first. That's hugely simplified, but it gets the point across. It's not that quibits can store a large amount of states, but that they can be in a huge number of states simultaneously, and you can hopefully collapse those down into whichever of those states you wish.

Those docking ports look like CADS systems. Is there any link between the two systems?

But germ cell lines by definition must also produce it, so there is a regulatory system that can control telomerase and also prevent cancer. I'm not completely disagreeing though, given that ovarian and testicular tumours are quite common causes of cancer, but I don't buy that simply increasing the expression of telomerase would automatically lead to cancer.

Very useful, as you could theoretically make much more efficient refrigerators with this, but it hardly breaks the laws of thermodynamics.

Is it just me, or did that explosion happen near the top of the capsule? Superdraco engine breaks off and shoots through the capsule like a bullet, exiting out of the docking ring?

Yeah, no, fair point there. As @Bill Phil pointed out though, centrifugal forces should mitigate these effects.

Telomeres: Yeah, fair enough, that had me worried too when I saw that. That being said, as his telomeres lengthened during his stay at the ISS, that hints that there is a way for adult, mature cells to lengthen their telomeres, and so there might be a pharmaceutical work around to this. Which would also, incidentally, be a potential game changer for geriatric medicine. Cognitive changes: remember that this is a guy on the sunset side of 55, so over one year he almost definatly would have a small but detectable decline in his cognitive abilities.

9:22, just after I get to work. Is there anyone for who this actually a reasonable time to watch?

Can we also sack the camera oparetors, who seemed to go on a smoke break juat after the rocket plume dissapated? Or the people who thought that what we really want to see, rather than the second stage ignition, it the TEL leaning serenely inti the breeze?

Don't forget: 2023: Yusaku Maezawa waves on his way past!

Something I've been wondering about concerning the Antares, is are they trying to sell it as a commercial launcher? Wikipedia lists several varients, but I can only see launches of Cygnus vehicles. Are they not selling it to others, or is it just not popular?

5th nation to touch the moon ain't nothing to sniff at!

It looks like they were at 134 m/s at 149m. RIP Beresheet.

It's especially jarring given that their live visualisation has English labels. But still, good luck everyone!

@Flying dutchman It happened, it apparently went well, but SpaceX are mulling over another one day delay, to Tuesday.

No, it's saying 'here are several pages describing the hypotheses behind the K-Pg extinction mechanisms, and we will not be giving you a firm answer, because that would be dishonest, as no one has a firm answer' Not all questions in science can be answered with a simple sentence, many of them require whole books to explain. We're not passing you off here, we're directing to to the best answer that we can give i.e. it's complicated! Oh, and the idea that the dinosaurs were at a low species diversity during the Late Maastrictian is just bad science IMO. We do only have one good Lägerstatten from that age (the Morrison Formation, from which we get our aquatic friends mentioned in the OP), but that could simply be a sampling bias. Here in Britain we have no rocks of that age, and continental Europe is similarly impoverished, so drawing conclusions based on that, doesn't seem very scientifically valid.

@kerbiloidit's kind of been proven that at least theropods were homeothermic, based on bone studies.

I'm not sure that it actually will change all that much in the debate between Chixulub and the Deccan Traps being the major stressor event. They've confirmed that fish were killed fairly close to the impact site, and while those fossils are fascinating and awesome to consider, no one was seriously suggesting that nothing was wiped out by Chixulub, its always been accepted as the major causitive event of the extinction in the western hemisphere. The debate was over the extinction events in Eurasia, Africa, India, and Austro-Antarctica, and the Hell Creek Formation doesn't have much to say about those localities. Beautiful fossils though!

Somehow, I doubt that SLS will only be delayed by half a year. Even if it isn't, and somehow the program accelerates to the point the SLS does in fact launch next year, the core stage is horribly oversized for its upper stage until the EUS gets funded, so switching to a commercial launcher is just generally a better idea.

This is a reversal of time, in a sense. It's like throwing a vase onto the ground, and then reversing your arm movement, and having the vase put itself back together in your hands. Not really time reversal, but it's actually easier to understand it if you think that time has actually reversed. So, the implications of this discovery in the context of reversable computing: Discuss!