Starship Asterisk*

If there was a Big Bang, and the Universe has continued to expand ever since, why are any colliding?

That they do implies that someone is drunk in charge of a Galaxy!
JOhn

Like Russell, just on the assertion that there is something there, I'm not going to waste my time staring at a picture of semirandom dots in the hope that it will resolve into an image. Next!
John

It would help, Sa Ji Tario, if you explained obscure words! A ceraunometer is an instrument used for counting the number of lightning discharges within a specific radius, says the Wiki. I think it works by receiving the radio noise from the flashes, not by ringing a bell. John PS, Neufer, that pictu...

Neufer,
thnak you, I think I shall put fulgura frango on my race car!

70km in one second is slower than a lightning stroke, which goes about 70 MILES in one second.
But I suppose this is going upwards so fighting gravity all the way!

JOhn

Thank you, Johnnydeep! I can accept a lake in Gale Crater, and sediment on the lower flanks of Mount Sharpe. The Wiki entry on Gale includes, "An unusual feature of Gale is an enormous mound of "sedimentary debris" around its central peak, officially named Aeolis Mons (popularly known...

Thank you, Chris, and Johnnydeep! Although I still can't see how "where now there is a mountain, there once was a lake..... the lake may have only been a few meters deep, just enough to form those sandstone deltas and thin layers of mud. But fluctuations in the water supply or the climate allow...

Quote, " cyclones usually occur over water, which makes sense since evaporating warm water gives them energy. " Elementary mistake, surely? CONDENSING vapour provides the typhoon's energy. Or am I too picky, the water vapour has to be evaporated first, which occurs in tropical regions, the...

The Mars Rovers' pictures and capabilities are always amazing, I love to see them! But feed my ignorance, please. Why is a "hill" a "Notch"? A notch is a groove or indentation, not a raised hummock. And why is Curiosity climbing Mount Sharp, "for clues about ancient water&qu...

Galactic 'shrooms, man! Far out!

Thank you, Ann, for your labelled version of this picture! Without it I was confused. But what a strange image! That red network seems to lie behind the galaxies, and that we are seeing the Energy Grid that lies between this and the next Universe, as in the Culture series of stories, by Sun-Earther ...

Serendipitously, this somewhat bland if historic video was automatically followed by one as short, "Descent torwads Bennu", and subsequently by two more from NASA on the later stages of the still incomplete Osiris-Rex mission. Definitely worth following, IMHO! Roll on September 2023!

Could the BHs emitting those jets be tumbling, precessing, so that instead of a straight jet along the axis, the direction varied with time?
This is happening to V404 Cygni : https://earthsky.org/space/black-hole-v ... rby-space/

Aren't some web searchers weird? To check quickly, I entered "moon feather hammer", not into my usual (couldn't be &rs%d to get that out) and the first entry was "Love Honey Fetish Selection. See Our Latest Fetish Wear." !?!?!? Web searchs use algorithms optimized to the use...

Hmm. When I put that search into Google I got the expected Apollo video at the top of the list. Google structures its search results based on what it thinks your interests are. So the question is... what else have you been searching for lately? Why would I want to do that, when I have this lady at ...

ta152h20, No, it was David Scott. Aren't some web searchers weird? To check quickly, I entered "moon feather hammer", not into my usual (couldn't be &rs%d to get that out) and the first entry was "Love Honey Fetish Selection. See Our Latest Fetish Wear." !?!?!? John Hmm. Whe...

ta152h20,
No, it was David Scott.

Aren't some web searchers weird? To check quickly, I entered "moon feather hammer", not into my usual (couldn't be &rs%d to get that out) and the first entry was "Love Honey Fetish Selection. See Our Latest Fetish Wear." !?!?!?

John

"The energy released by "landing on" is determined by the velocity of impact." Surely, 'times the mass of the object', Johnny? I'll bet that David Scott's hammer made a bigger hole in the moon dust than the feather! Same velocity, more energy. John PS Fred, your links seem out of...

Does the slower fall speed make it safer for a person to fall that distance? You will note, if you watched the video, that even onto Ceres that has the lowest g used, the terminal velocity was 90kph, or 55mph. All others were in hundreds of kph. Since your falling astronaut will lack the security o...

Does the slower fall speed make it safer for a person to fall that distance? SC, You will note, if you watched the video, that even onto Ceres that has the lowest g used, the terminal velocity was 90kph, or 55mph. All others were in hundreds of kph. Since your falling astronaut will lack the securi...

Thnak you, All, especially Ann and Chris! I'm glad I asked the question, about colours and distance, because as I have said before, and IMHO of course, this should be a site with a scientific emphasis, where we can marvel at the beauty that is in astronomical science. The 'retouching' of star pictur...

Today's blurb seems fixated on explaining gravitational lensing, and does so well, but at the expense of explaning the picture. For those who are unfamiliar with "Abell 3827", like me, it is the four bright objects near the centre. A link to, say, the Wiki entry would help: https://en.wiki...

Thank you all!
John

Thank you, Ann and Chris! My next assignment is clear! Meanwhile, and if I may, isn't a photon a photon? For photons to have different energies, they will have different frequencies? Sure, near the star, an atom is more likely to receive a photon more frequently, perhaps leading to the doubly ionios...

Chris, OK, I imagined a simple explanation, and was wrong, but I can do complexity! You will be as short of time as any busy academic - please refer me to some source that will explain the mechanism? Neufer, Thank you! So the blue is due to Oxygen, not Helium? But why is that fluorescing near the st...