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that is correct if we stay in the same spacetime inertial reference as on earth, at the time and place of departure. Did you watch Brian Cox's newest series on the BBC's 'universe'? In episode 4, Cox talked about the big black hole at the centre of our galaxy, the Milky Way. Astromoners call it...

I suppose in the future, it will be magnetic reconnection instead of burning hydrogen. Imagine a magnetic link between a space station and an earth station. Your capsule is propelled along the magnetic field lines. quote: magnetic fields in highly charged plasma environments automatically...

my guilty pleasure is skiing.

that's rather short sighted. If you compare the early space Soviet flights with the last Blue Origin flight, you can see the enormous progress that has been made. We won't of course go to another home planet with Bezos rocket anytime soon but it's the kind of technology that will eventually lead...

these things are separate issues. If you have billions in your wallet, what would you do with them in your limited time left on this planet? If governments re-distribute wealth through taxation, there will be a lot fewer extremely wealthy individuals and their excesses.

he spends his money developing rocket engines, re-useable booster rockets, vertical take off and landing. They are part of global research effort.

we can only save this planet with technology. Better solar panels, more wind turbines, more electric transports etc. Ask yourself why a train ticket from London to Glasgow cost 4 times a plane ticket. It's not because of the cost of fuel.

I do know that 95% hydrogen are currently made from fossil fuel, nevertheless, his project of Blue Origin has good prospects and using liquid hydrogen as propellant for his rocket is the way to go for now. More and more CCS systems are added to hydrogen production ('blue hydrogen') to limit CO2...

accuracy is important though. Take the carbon footprint of the LHC. Its original aim was to confirm the existence of the Higgs boson. Is it woth it? You could also say the same about a lot of other endeavours like sending telescopes into orbit. Sometimes you need real experiments. They will seem...

I think with the latest panels, we can get around 175kWH per SQM per year.

his rocket burns liquid hydrogen.

The G20 countries are responsible for 80% of emission and probably more than that for pollution, so they should solve the problem themselves. I am skeptical on the way they go about it. Setting net zero target for year X alone does not guarantee that it will happen on year X. Promising to donate...

if you have a Woosh bike, contact support.

agreed. They try to save the planet by yearly donations from G20 countries. That makes me think of the BBC 'Save the children' show every year. Doomed to fail.

“He’s telling me we’re going to have to take on extra staff because we’re going to be so busy,” Perkes says. “With all this free trade, they’re going to want our fish.” Asked how he now views the prime minister, he pauses. “I’m disappointed,” he replies bitterly. “He never mentioned the extra...

After the Chernobyl accident, The Poles gave iodine to children. The dose does not remove the iodine in the thyroid but stops the uptake of radio-active iodine present in the environment thus limits the damage.

True for other vaccines too. Look at how many attempts at producing a vaccine for malaria.

the TPO is a self-protein, so not attacked by the immune system (central tolerance).

we expect antigens cause diseases, vaccines don't though.

I had my Pfizer booster jab earlier this week. Unlike the AZ, the Pfizer gave a much stronger reaction. A small lump at the injection site and a sore arm for 4 days. Substitute the sore arm for lungs, it's not difficult to imagine what effect a real covid infection has on a pensioner. The...