Recent comments in /f/space

ajamesmccarthy OP t1_j98sd1x wrote

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websterhamster t1_j98s3tz wrote

I love how they used the extremely technical and scientific benchmark of Rice Krispies to compare the noise level of the Artemis I launch.

I mean, forget explaining decibels. Rice Krispies is something everyone can understand.

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Freetrilly OP t1_j98rvqb wrote

Funny thing is this is the first drawing ive done in 15 years. I got a waicom 24 pro and just started going and didnt stop like 3 weeks ago. Ive not a super good artist but something about drawing the deep unknown just feels so natural. I will keep your words next time I’m feeling discouraged thank you again.

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marketrent OP t1_j98r4w9 wrote

Excerpt from the linked release^1 by AIP Publishing about noise measurements taken at five stations located 1.5 km to 5.2 km from the launch pad:^2

>When the Artemis 1 mission was launched by NASA’s Space Launch System, SLS, in November, it became the world’s most powerful rocket, exceeding the thrust of the previous record holder, Saturn 5, by 13%.

>With liftoff came a loud roar heard miles away.

>In JASA Express Letters, published on behalf of the Acoustical Society of America by AIP Publishing, researchers from Brigham Young University and Rollins College in Florida reported noise measurements during the launch at different locations around Kennedy Space Center.

>The data collected can be used to validate existing noise prediction models, which are needed to protect equipment as well as the surrounding environment and community.

>These data will be useful as more powerful lift vehicles, including the SLS series, are developed.

> 

>“We hope these early results will help prevent the spread of possible misinformation, as happened with the Saturn 5,” author Kent Gee said.

>“Numerous websites and discussion forums suggested sound levels that were far too high, with inaccurate reports of the Saturn 5’s sound waves melting concrete and causing grass fires.”

>A characteristic feature of rocket launches is a crackling sound from shock waves.

>These shocks represent instantaneous sound pressure increases that are much louder than crackling noises encountered in everyday life.

>Author Whitney Coyle said, “We found the Artemis-I noise level at 5 km had a crackling quality about 40 million times greater than a bowl of Rice Krispies.”

^1 The Roar and Crackle of Artemis 1, AIP Publishing, 14 Feb. 2023, https://publishing.aip.org/publications/latest-content/the-roar-and-crackle-of-artemis-1/

^2 Kent L. Gee, et al. Space Launch System acoustics: Far-field noise measurements of the Artemis-I launch. JASA Express Letters 3, 023601 (2023); https://doi.org/10.1121/10.0016878

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PrimalZed t1_j98qurj wrote

> That's not because this area isn't incredibly vibrant, but because your eyes can't resolve color when things are this faint. It's like trying to see the color in flowers in moonlight, you can't.

Is that to say that the red haze here is stuff reflecting light, not emanating it? If so, what is the light it's reflecting emanated from?

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de_hell t1_j98pfav wrote

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mortalphysicist t1_j98ntux wrote

Yes! And if you notice the upper half of the picture looks like a dry ocean (you can see the high edge of a coast line). Now, one thing you notice is there are very few craters in that area that looks like it once had an ocean.

This is more evidence that this particular area was covered with water, which absorbed many of the impacts!

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djellison t1_j98mkgm wrote

Many have advocated for that via a variety of different means.....and it's simply not enough

https://lasp.colorado.edu/home/maven/files/2018/08/Inventory-of-CO2-available-for-terraforming-Mars.pdf

There is not enough CO2 left on Mars in any known, readily accessible reservoir, if mobilized and emplaced into the atmosphere, to produce any significant increase in temperature or pressure. Even if enough CO2 were to be available, it would not be feasible to mobilize it; doing so would require processing a major fraction of the surface (analogous to regional- or planet-scale strip mining) to release it into the atmosphere, which is beyond present-day technology. Terraforming Mars is therefore not possible in the foreseeable future by utilizing CO2 resources available on the planet.

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