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Old 06-01-2014, 09:40 AM  
DaFace DaFace is offline
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Space Exploration megathread
Since a number of cool things are happening in space exploration these days, we'll widen the scope of this thread a smidge. Conversation about all things space exploration are welcome, whether it be from NASA, SpaceX, ULA, Blue Origin, or anyone else. Chances are most of the discussion will still be about SpaceX since they love to make things public and fun, but nothing's off limits. I'll eventually get around to modifying the OP to include resources for other companies too, but in the meantime, feel free to post any cool stuff you run across.

Lists of Upcoming Missions



How to Watch a Live Launch


Where to Learn More
Spoiler!


Glossary
Spoiler!
Last edited by DaFace; 12-10-2020 at 03:36 PM..
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Old 06-05-2020, 01:19 PM   #3031
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4 months? Holy cow! That's nearly 31,000 miles per hour.
You have to go nearly that fast just to escape the Earth's gravity. Apollo 11 was around 25,000 mph.
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Old 06-05-2020, 01:45 PM   #3032
treeguy27 treeguy27 is offline
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I don't think he's too off the mark in terms of cargo but a manned mission to Mars in 2024?

Has Space X even built whatever ship is taking the astronauts on their 18 month journey?

Won't they need a ship in orbit and a lander, too?
I'm pretty sure "Starship" is being designed just like the Falcon 9, in that it can use it's engines to descend to the surface and land upright. Then it will take back off vertically to head back.
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Old 06-05-2020, 01:55 PM   #3033
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For those interested. I didn't realize that they were planning on 100% Mars-generated fuel for the return.

https://www.spacex.com/human-spaceflight/mars/
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Old 06-05-2020, 02:13 PM   #3034
MagicHef MagicHef is online now
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For those interested. I didn't realize that they were planning on 100% Mars-generated fuel for the return.

https://www.spacex.com/human-spaceflight/mars/
Yep, that's why the Raptor engine is so important, methane can be made on Mars. The flying water tower last year was the first time ever that a methane full flow staged combustion engine took flight.
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Old 06-05-2020, 04:27 PM   #3035
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Old 06-05-2020, 04:44 PM   #3036
DaneMcCloud DaneMcCloud is offline
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You have to go nearly that fast just to escape the Earth's gravity. Apollo 11 was around 25,000 mph.
Right, and I fully understand the physics of breaking out of the Earth's orbit.

I just had no idea that science and technology are at the point where it's possible to reach Mars in 4 months.

With that being the case, I would imagine that the commute to Mars will take a week or less before the end of this century.

Is interstellar travel that far behind?
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Old 06-05-2020, 04:52 PM   #3037
Dartgod Dartgod is offline
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Florida from the space station
Who are all those people in your back yard?
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Old 06-05-2020, 04:58 PM   #3038
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Who are all those people in your back yard?
Mainly Cubans and snowbirds from NY?
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Old 06-05-2020, 05:42 PM   #3039
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Right, and I fully understand the physics of breaking out of the Earth's orbit.

I just had no idea that science and technology are at the point where it's possible to reach Mars in 4 months.

With that being the case, I would imagine that the commute to Mars will take a week or less before the end of this century.

Is interstellar travel that far behind?
IIRC, someone posted a vid about how we have nearly perfected ion propulsion a while back. I'll see if I can dig the vid up.
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Old 06-05-2020, 05:47 PM   #3040
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Here you go
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Old 06-05-2020, 06:02 PM   #3041
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And just for shits and grins
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Old 06-05-2020, 11:05 PM   #3042
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And just for shits and grins
Unfortunately, actual humans would be very sadly incapable of that travel. It would kill them pretty quickly because of hydrogen itself.

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Trouble is, traveling close to the speed of light brings about other effects, too. In Natural Science, Edelstein and Edelstein point out that hydrogen in any craft cable of traveling at the speed of light would also prevent it from traveling at the speed of light. They explain:

Unfortunately, as spaceship velocities approach the speed of light, interstellar hydrogen H, although only present at a density of approximately 1.8 atoms/cm3, turns into intense radiation that would quickly kill passengers and destroy electronic instrumentation. In addition, the energy loss of ionizing radiation passing through the ship's hull represents an increasing heat load that necessitates large expenditures of energy to cool the ship.

In other words, travel close to the speed of light and you'll be bombarded with so much radiation that you kick the bucket. The knock-on effect is that even if it's possible to create a craft capable of traveling close the speed of light, it wouldn't be able to transport people.

Instead, there's a natural speed limit imposed by safe levels of radiation due to hydrogen, which means humans couldn't travel faster than half the speed of light unless they were willing to die almost immediately. Dammit.



https://gizmodo.com/super-fast-space...inutes-5957697
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Old 06-05-2020, 11:25 PM   #3043
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Old 06-10-2020, 08:46 PM   #3044
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If any night owls are interested RocketLab has a NASA launch tonight at 11:25pm (with a 2-hour launch window). It's a tiny little rocket, but still fun to watch.

Here's the official stream:
https://www.youtube.com/watch?v=-zzu7hI0ESM

And here's Tim Dodd's hosted version, which I like just because he has good commentary.
https://www.youtube.com/watch?v=DbUbuH7pkU0
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Old 06-10-2020, 08:46 PM   #3045
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Also, this is super cool.
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