Kevin_Hall
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Posts posted by Kevin_Hall
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The "cube" on the far side of Moon had been captured by China’s Yutu 2 Rover.
As it was after found out, it was a common moon rock.
https://www.popsci.com/science/chinas-rover-mysterious-hut-on-moon/
https://www.space.com/moon-mystery-hut-rabbit-shaped-rock-china-rover0 -
21 hours ago, Airbrush said:
They designed the JWST to be capable of being refueled robotically, just in case anyone gets around to financing such a mission in 10 or 15 years. If the JWST performs outstanding, maybe that performance will change some minds, and they would extend its' life thru a refueling mission.
"...modest efforts being made to make JWST “serviceable” like Hubble, according to Scott Willoughby, JWST’s program manager at Northrop Grumman Aerospace Systems in Redondo Beach, California. The aerospace firm is NASA’s prime contractor to develop and integrate JWST, and has been tasked with provisioning for a “launch vehicle interface ring” on the telescope that could be “grasped by something,” whether astronaut or remotely operated robot, Willoughby says. If a spacecraft were sent out to L2 to dock with JWST, it could then attempt repairs—or, if the observatory is well-functioning, simply top off its fuel tank to extend its life."
I read that JWST has got enough fuel to last 20 years, but there is another question: it's said that JWST is threatened by being hit by space debris. Does anybody know any details of it?
https://www.space.com/james-webb-space-telescope-fuel-20-years0 -
1 hour ago, Genady said:
What problem?
How are future colonialists going to overcome Mars's gravity? Low gravity will definitely affect their bodies.
I mean this problem. Beg my pardon for not having fully described my question.0 -
Mars gravity is 3.721 m/s2, which is about 2.65 less than Earth's gravity
How could Mars low gravity problem be solved?
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The idea is rather old: we put a bunch of Al foil 10 microns thick and reflect the solar flux over the daytime part of the planet. What sea level area will be shaded by 1 km2 of such foil at an altitude of 1000 km?
Does it make sense to raise such an umbrella on the Geostationary orbit?0 -
4 minutes ago, exchemist said:
Um, Kevin, Elon (Musk) is a person. Perhaps you mean Space X is on its way to using CO2 for rocket fuel. However all I can find on this is some throwaway comment on social media from Musk. Do you have information about a concrete proposal from Space X to do this? How do they plan to do it?
I mean Elon claimed that SpaceX was going to absorb CO2 to create rocket fuel. I thought it was clear.
Such solutions do already exist, such as NASA's one
https://technology.nasa.gov/patent/TOP2-160
As a matter of fact, such technology has been used by Canadian company Carbon Engineering
https://www.nationalgeographic.com/science/article/carbon-engineering-liquid-fuel-carbon-capture-neutral-science
By the way, what is your personal opinion on creating rocket fuel using plastic waste, exchemist?0 -
21 hours ago, MigL said:
Problem is, rocket fuel has to have a certain efficiency.
The thrust provided by the mass of propellant has to be able to acheive orbit.So, you think plastic waste will never become a source for producing rocket fuel, because it will have zero efficiency?
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25 minutes ago, beecee said:
Do you know if JSWT is capable of capturing BH? I know that it's not its main goal, though if it could we would discover much more than we expect.
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While Elon is on its way to use CO2 to produce rocket fuel, I've got another question.
Is it actually possible to reduce plastic waste into rocket fuel?0 -
How will geomagnetic reversal influence Earth?
How is this process going?
Thanks for your replies!0 -
16 hours ago, beecee said:
The Tiny Dots in This Image Aren't Stars or Galaxies. They're Black Holes
MICHELLE STARR
2 JANUARY 2022
The image above may look like a fairly normal picture of the night sky, but what you're looking at is a lot more special than just glittering stars. Each of those white dots is an active supermassive black hole.
And each of those black holes is devouring material at the heart of a galaxy millions of light-years away – that's how they could be pinpointed at all.
more at link.....
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Awesome!!
Really great number of BHs, that's insane. Imagine that somewhere in parallel universe people are looking at an image with plenty of white holes 😀
How wonderful it would be to have such a telescope to capture a BH..0 -
ISS astronauts recorded a video to wish a Happy New Year
https://tass.com/science/1383067
Happy New Year! Wish you good luck and persistence during next year!0 -
Russian scientists have discovered a new mechanism for the formation of formaldehyde in space - a compound that plays a significant role in the synthesis of organic compounds necessary for the origin of life on Earth.
According to the new results, organic molecules can appear in molecular clouds in the early stages of evolution, that is, much earlier than the formation of stars in them.
Molecules of water carry out the transfer of protons from oxygen atoms to a carbon atom, which catalyzes the formaldehyde synthesis reaction without the need for a large amount of energy.
Source: https://pubs.acs.org/doi/10.1021/acs.jpclett.1c027600 -
On 12/25/2021 at 5:18 PM, Andrewler said:
Has life been discovered on those planets?
Waiting for JWST to tell us 😀. Joke
Actually not yet, but there is an interesting arcticle about it in Discover mag
https://www.discovermagazine.com/the-sciences/can-life-exist-on-a-rogue-planet0 -
Astronomers have found 70 wandering planets after having processed 20-years collected data.
Wadnering planets are the planets that are located in interstellar space and are not gravitationally associated with a star or brown dwarf. Over the past 20 years, about two dozen such bodies have been discovered.
The source: https://www.nature.com/articles/s41550-021-01513-x0 -
On 12/21/2021 at 5:21 PM, exchemist said:
There is not much point people here reciting basic information that is widely available on-line. Suggest reading, say, the Wiki article and then asking any questions you have arising from that.
But I must say this is a very odd question for someone who teaches astronomy to be asking.
In my opinion, SCIENCE forum is not about to express your emotions, but facts, exchange knowledge and objective thoughts.
Thanks, gentlemen.0 -
11 minutes ago, dimreepr said:
Dark matter is what we know, about what we don't know...
Socrates would have appreciated your thought)
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What is dark matter and what we know about it?
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A subtle smile emerged on Dr. James Leidner’s face as he envisioned telling people of the unusual contribution he made to mankind’s mission to Mars. For 72 straight hours, the study volunteer lay in a bed at UT Southwestern, the monotony broken only at night when researchers placed his lower body in a sealed, vacuum-equipped sleeping bag to pull down body fluids that naturally flowed into his head while supine. New research published in JAMA Ophthalmology shows that by suctioning these fluids and unloading brain pressure, the specially designed sleeping bag may prevent vision problems astronauts endure in space, where fluids float into the head and continually push and reshape the back of the eyeball.
https://www.eurekalert.org/news-releases/936908
I Hope there won't be any problems while its exploitation. What do you think of it?0 -
On 12/10/2021 at 8:41 PM, swansont said:
Did you mean 12 weeks?
Weren't there tourists in space (briefly) back in October? I know Shatner played Captain Kirk, but he still counts as a tourist.
They went for the suborbital flight, while Yusaku and Yozo are on the orbit now. They are spending 12 days there https://www.nytimes.com/2021/12/08/science/yusaku-maezawa-space-station.html
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59 minutes ago, exchemist said:
OK, so contrary to what your profile says, you do not teach astronomy at a school in the UK. Correct?
My profile shows relevant information to the field of my business.
I am not sure, if it is okay to discuss either mine or yours personal information here and I would rather get focused to the subject. Thank you gentlemen.0 -
On 12/11/2021 at 5:30 PM, exchemist said:
Hoho. But it's not a subject as such, to the extent that there are teachers employed to teach astronomy, so far as I know.
But I'd be interested to hear what, um, Kevin has to say - and how he expresses himself.
Astronomy uses mathematics, physics, and chemistry. Weather it out of curriculum or not - there are Master and PhD programs that are popular to continue one's career in UK.
Lots of proposals, though I am not to mention exact projects here.
Thank you.
Best wishes!2 -
On the December, 8 Yusaku Maezawa and Yozo Hirano have docked to the ISS module “Search". They were from Baikonur Cosmodrome where Yuri Gagarin’s first ever flight to space had taken place in 1961. Also it’s known that they are going to make a first ever made painting using brushes in space. On the ISS, they will have access to both the Russian and American segments of the ISS. The return of the crew is scheduled for December 20.
https://spaceadventures.com/ms-20/
https://www.theguardian.com/science/2021/dec/08/dream-come-true-japanese-billionaire-blasts-off-for-iss0 -
13 hours ago, zapatos said:
So Bill Gates has lost the courage to live and has motivation equal to 0? I think the evidence tells us otherwise.
I mean if you have an unlimited access to smth you don't want this anymore.
If you have a lot of money you don't want to earn it, if you have no money your only desire is to have it.
That's why Bill Gates does charity and Elon makes rockets. They don't want money, they want something more valuable and global. Now they have another values, more than just money
So if you live forever, there is no sence in such life, that's my opinion
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Can Sirius go supernova?
in Astronomy and Cosmology
Posted
Can Sirius go supernova after thousands of years and what would happen? I'm very curious to figure it out.
I read Calvin Belk thought on it and he says that
What do you think of it?