Cool astronomy photos

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sparks
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Re: Cool astronomy photos

Post by sparks »

Mars is always at opposition, he's the Gawd of war after all. :)
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Skeeve
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Re: Cool astronomy photos (change-4)

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Anaxagoras wrote: Thu Jan 03, 2019 1:30 pm
Witness wrote: Thu Jan 03, 2019 4:57 am Chang’e 4 successfully landed on the far side of the moon.
First photos published:
UPDATE: New measurements show moon has hazardous radiation levels

Say WHAT?
:o
Future moon explorers will be bombarded with two to three times more radiation than astronauts aboard the International Space Station, a health hazard that will require thick-walled shelters for protection, scientists reported Friday.
China's lander on the far side of the moon is providing the first full measurements of radiation exposure from the lunar surface, vital information for NASA and others aiming to send astronauts to the moon, the study noted.

A Chinese-German team reported on the radiation data collected by the lander—named Chang'e 4 for the Chinese moon goddess—in the U.S. journal Science Advances.

"This is an immense achievement in the sense that now we have a data set which we can use to benchmark our radiation" and better understand the potential risk to people on the moon, said Thomas Berger, a physicist with the German Space Agency's medicine institute.

Astronauts would get 200 to 1,000 times more radiation on the moon than what we experience on Earth—or five to 10 times more than passengers on a trans-Atlantic airline flight, noted Robert Wimmer-Schweingruber of Christian-Albrechts University in Kiel, Germany.

"The difference is, however, that we're not on such a flight for as long as astronauts would be when they're exploring the moon," Wimmer-Schweingruber said in an email.

Cancer is the primary risk.

"Humans are not really made for these radiation levels and should protect themselves when on the moon," he added.

Radiation levels should be pretty much the same all over the moon, except for near the walls of deep craters, Wimmer-Schweingruber said.

"Basically, the less you see of the sky, the better. That's the primary source of the radiation," he said.

Wimmer-Schweingruber said the radiation levels are close to what models had predicted. The levels measured by Chang'e 4, in fact, "agree nearly exactly" with measurements by a detector on a NASA orbiter that has been circling the moon for more than a decade[/highlight], said Kerry Lee, a space radiation expert at Johnson Space Center in Houston.

"It is nice to see confirmation of what we think and our understanding of how radiation interacts with the moon is as expected," said Lee, who was not involved in the Chinese-led study.

In a detailed outline released this week, NASA said the first pair of astronauts to land on the moon under the new Artemis program would spend about a week on the lunar surface, more than twice as long as the Apollo crews did a half-century ago. Expeditions would last one to two months once a base camp is established.

NASA is looking to put astronauts on the moon by the end of 2024, an accelerated pace ordered by the White House, and on Mars sometime in the 2030s.

The space agency said it will have radiation detectors and a safe shelter aboard all Orion crew capsules flying to the moon. As for the actual landers, three separate corporate teams are developing their own craft with NASA oversight. For the first Artemis moon landing, at least, the astronauts will live in the ascent portion of their lander.

The German researchers suggest shelters built of moon dirt—readily available material—for stays of more than a few days. The walls should be 80 centimeters (about 2 1/2 feet) thick, they said. Any thicker and the dirt will emit its own secondary radiation, created when galactic cosmic rays interact with the lunar soil.

"So in this sense—I think the walls of European Castles would be too thick!" Berger wrote in an email.
So, was there less radiation in 1969, or did all that jumping around and stuff help those dudes fight cancer...
If there was less radiation back then, what happened?
Is global warming to blame?

Inquiring minds want to know!
Then Skank Of America could start in...
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Witness
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Re: Cool astronomy photos

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↑ Not really fresh news, the whole of space is full of radiation (fast protons and hard UV from the Sun + cosmic rays, which can be anything), so we fragile meatbags better stay under our cushy atmosphere. And send robots.



Equinox in the Sky

Image

Does the Sun set in the same direction every day? No, the direction of sunset depends on the time of the year. Although the Sun always sets approximately toward the west, on an equinox like today the Sun sets directly toward the west. After today's September equinox, the Sun will set increasingly toward the southwest, reaching its maximum displacement at the December solstice. Before today's September equinox, the Sun had set toward the northwest, reaching its maximum displacement at the June solstice. The featured time-lapse image shows seven bands of the Sun setting one day each month from 2019 December through 2020 June. These image sequences were taken from Alberta, Canada -- well north of the Earth's equator -- and feature the city of Edmonton in the foreground. The middle band shows the Sun setting during the last equinox -- in March. From this location, the Sun will set along this same equinox band again today.
https://apod.nasa.gov/apod/ap200922.html
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Fid
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Re: Cool astronomy photos

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Well duhh... the moon landing hoaxtards say the Van Allen radiation belt would have fried anyone. This is true but (slaps ample butt) it wasn't like they lounged around there.
... The stars were suns, but so far away they were just little points of light ... The scale of the universe suddenly opened up to me. It was a kind of religious experience. There was a magnificence to it, a grandeur, a scale which has never left me. Never ever left me.
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Witness
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Re: Cool astronomy photos

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Filaments of the Cygnus Loop

Image

What lies at the edge of an expanding supernova? Subtle and delicate in appearance, these ribbons of shocked interstellar gas are part of a blast wave at the expanding edge of a violent stellar explosion that would have been easily visible to humans during the late stone age, about 20,000 years ago. The featured image was recorded by the Hubble Space Telescope and is a closeup of the outer edge of a supernova remnant known as the Cygnus Loop or Veil Nebula. The filamentary shock front is moving toward the top of the frame at about 170 kilometers per second, while glowing in light emitted by atoms of excited hydrogen gas. The distances to stars thought to be interacting with the Cygnus Loop have recently been found by the Gaia mission to be about 2400 light years distant. The whole Cygnus Loop spans six full Moons across the sky, corresponding to about 130 light years, and parts can be seen with a small telescope toward the constellation of the Swan (Cygnus).
https://apod.nasa.gov/apod/astropix.html
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Bruce
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Re: Cool astronomy photos

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This is one of the coolest discoveries I've ever seen...

https://apod.nasa.gov/apod/ap200929.html

It's a solar system with 3 stars. Besides being cool, it shouldn't even exist. There is a classic physics conundrum called the Three Body Problem.

https://en.m.wikipedia.org/wiki/Three-body_problem

Basically, the whole reason we only see single and binary solar systems is because three stars don't seem to form a stable orbit. One of the three quickly gets chucked. There are special and bizarre mathematical solutions to the 3 body problem, but this is the first real life example that I'm aware of.

The painfully brief paragraph about this system indicates that it could break apart in the near future, or that it may be in the process of breaking apart, but the fact that the system formed such beautiful concentric rings indicates that it has remained relatively stable for quite a long time. Would love to see more study on this system and would love to know if the orbits follow on of the mathematical 3 body solutions. 8)
Such potential!
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Re: Cool astronomy photos

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Not to be pedantic, but I don't think the three body problem means that trinary star systems don't exist. It just means that it's difficult to predict how they will behave using Newton's laws of motion. Not impossible, but difficult.

https://en.wikipedia.org/wiki/Star_system#Trinary
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Re: Cool astronomy photos

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Image
Such potential!
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Abdul Alhazred
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Re: Cool astronomy photos

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Bruce wrote: Wed Sep 30, 2020 2:03 am There are special and bizarre mathematical solutions to the 3 body problem, but this is the first real life example that I'm aware of.
And if there happens to be intelligent life there, with at least 19th century level astronomical knowledge of their immediate neighborhood, they have fundamentalists who point to that very improbability as proof of God. 8)
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Re: Cool astronomy photos

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The earth moon and sun is a three body problem
still working on Sophrosyne, but I will no doubt end up with Hubris
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Re: Cool astronomy photos

Post by Abdul Alhazred »

The "three body problem" means a general solution that covers all cases.
It must exist in principle, but is undiscovered.

There is a general solution to the two body problem.
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Re: Cool astronomy photos

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robinson wrote: Wed Sep 30, 2020 2:29 pm The earth moon and sun is a three body problem
It's a 3 body solution, thanks to GOWD. :P
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Re: Cool astronomy photos

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Robinson is a one body problem. :D :D :D
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sparks
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Re: Cool astronomy photos

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He simply excludes that we are fortunate in that the bodies in our planetary system are largely in the same plane. A fact easily overlooked by any unimaginative street-fool. :)
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Re: Cool astronomy photos

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HubbleESA


This video shows a unique time-lapse of the supernova in galaxy NGC 2525. The supernova is captured by Hubble in exquisite detail within this galaxy in the lower left portion of the frame. It appears as a very bright star located on the outer edge of one of its beautiful swirling spiral arms. This new and unique time-lapse of Hubble images shows the once bright supernova initially outshining the brightest stars in the galaxy, before fading into obscurity during the telescope’s observations. This time-lapse consists of observations taken over the course of one year, from February 2018 to February 2019.

NGC 2525 is located nearly 70 million light-years from Earth and is part of the constellation of Puppis in the southern hemisphere. Hubble captured this series of images of NGC2525 in 2018 as part of one of its major investigations; measuring the expansion rate of the Universe, which can help answer fundamental questions about our Universe’s very nature.

The whole galaxy for reference:

Image
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Re: Cool astronomy photos

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Re: Cool astronomy photos

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Just got my new avatar from that
still working on Sophrosyne, but I will no doubt end up with Hubris
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Re: Cool astronomy photos

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pillars avatar.png
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still working on Sophrosyne, but I will no doubt end up with Hubris
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Re: Cool astronomy photos

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Planet Earth, from a company said to be able to take a picture of any place inside of 24 hours. They have a nice gallery here: https://www.planet.com/gallery/.

Image

Image
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Re: Cool astronomy photos

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Witness wrote: Wed Oct 07, 2020 1:47 am Planet Earth, from a company said to be able to take a picture of any place inside of 24 hours. They have a nice gallery here: https://www.planet.com/gallery/.

Image
Wow, That looks vulnerable to me.
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