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originally posted by: ChaosComplex
originally posted by: JustMike
So, I don't know why you referenced the thickness of a pressure vessel within the SM (where the astronauts never were) in order to support your assertion that the shielding of the CM spacecraft was inadequate.
Yes you do, we all know why simple things are misrepresented and twisted to fit ridiculous claims. It's difficult to fabricate your own reality based on real facts, that wouldn't be very fun now would it?
originally posted by: Zaphod58
a reply to: MerkabaMeditation
It's been explained repeatedly to you. Notice where they're planning on going? MARS. That requires a different trajectory than the moon.
originally posted by: Bilk22
Oh and just how did they "use low exposure"? What does that even mean? (I assume you want us to believe they just zipped past the VAs at hyper speed)
originally posted by: WanderingSage
a reply to: MerkabaMeditation
Is it possible that 40-50 years ago they just didn't know about the radiation. I mean the astronauts could have gotten lucky and didn't get to messed up from it. I myself was exposed to gamma radiation and I'm fine. Not saying that this is what I think the case is, but it IS possible.
Polyethylene is radiation shielding? Really? You want to go with that?
Polyethylene is a good shielding material because it has high hydrogen content, and hydrogen atoms are good at absorbing and dispersing radiation. In fact, researchers have been studying the use of polyethylene as a shielding material for some time. One of several novel material developments that the team is testing is reinforced polyethylene. Raj Kaul, a scientist in the Marshall Center's Engineering Directorate, previously has worked with this material on protective armor for helicopters.
"Since it is a ballistic shield, it also deflects micrometeorites," Kaul says. "Since it's a fabric, it can be draped around molds and shaped into specific spacecraft components."
The probe repeatedly passed through Earth's Van Allen radiation belts. Indian officials mitigated the threat by beefing up the craft's computers with radiation shielding.
It passed through the dangerous Van Allen belt, which has radiation that can damage electronic systems, and came out unscathed.
originally posted by: Zaphod58
a reply to: MerkabaMeditation
It's the difference between a trip of a few hundred thousand miles, and trip of several million miles to a totally different orbit. It's going to depend on when they launch, that will determine the trajectory that they use. Space trips are not one size fits all.
-NASA Engineer
Naturally, we have to pass through this danger zone twice, once up and once back.
originally posted by: Zaphod58
a reply to: MerkabaMeditation
That's because they will be much larger than a probe, which means they can carry more fuel. The basic trajectory will still be the same regardless, and will still require a trip through the thicker portions of the Belts, where electronics and astronauts can both suffer damage without proper shielding.
originally posted by: Zaphod58
a reply to: MerkabaMeditation
Larger than a probe. So now you're saying that Orion is a probe, not a manned craft?
The Mars Orbiter Mission, launched by India weighs less than 3,000 lbs fully fueled with all the components attached. It weighs a little over 1,000 lbs with no fuel on board. The Orion capsule weighs over 21,000 lbs at liftoff, and the service module weighs over 27,000 lbs at liftoff.
That sure seems to make sense to me that it can carry a lot more fuel than a probe.
originally posted by: Zaphod58
a reply to: MerkabaMeditation
Once again, it will depend on when they launch what the best trajectory is going to be. There may be some that don't have to go through the thicker portions of the Belts, but those might be when Mars is farther away, so you don't want to use them. There is no "set" trajectory to anywhere, it's all dependent on when you launch the mission, and how far away the target is.
But again, Orion is also going to be used to go for an asteroid landing, which means that they may have to go through any trajectory to get to it. So they're making a one capsule for all uses system, instead of different capsules for different missions. Apollo was only good for LEO, and moon landings. Orion is going to be designed to go for several different missions to keep costs down.
originally posted by: Zaphod58
a reply to: MerkabaMeditation
Larger than a probe. What the hell does Apollo have to do with Orion being larger than a probe, or able to carry more fuel than a probe. I didn't think it was THAT hard to understand.