Recent comments in /f/space

mcoombes314 t1_j6ovnct wrote

Reply to comment by phasechanges in A spaceflight disaster was narrowly avoided in 1972. A series of intense solar flares exploded in August, just months before the launch of Apollo 17. Any astronauts on the moon at that time would have died from radiation. As NASA's new lunar missions progress, the threat of radiation still looms. by EricFromOuterSpace

And who thinks it's a good idea to give one value in km and the other in miles? Either stick to one or do both.

1

H-K_47 t1_j6ovfpv wrote

Reply to comment by do0tz in A spaceflight disaster was narrowly avoided in 1972. A series of intense solar flares exploded in August, just months before the launch of Apollo 17. Any astronauts on the moon at that time would have died from radiation. As NASA's new lunar missions progress, the threat of radiation still looms. by EricFromOuterSpace

Seems to be pretty specialized. Here's some articles on it:

https://sservi.nasa.gov/articles/building-a-lunar-base-with-3d-printing/

https://www.esa.int/ESA_Multimedia/Images/2018/11/3D-printed_ceramic_parts_made_from_lunar_regolith

22

Friendlyhitman t1_j6oqgbg wrote

Reply to Will machine learning help us find extraterrestrial life? by YZXFILE

We already have... or at least "They" already have. But there is, understandably, no intent or desire to communicate. I will never forget how a Belgian Airforce colonel in the eighties, who was absolutely not a ufo believer, risked his reputation, together with several other officials, admitted they saw what could only be described as extraterrestial objects: https://www.youtube.com/watch?v=8M-ls_qP98M

2

Schyte96 t1_j6oqcif wrote

Reply to comment by Musicfan637 in A spaceflight disaster was narrowly avoided in 1972. A series of intense solar flares exploded in August, just months before the launch of Apollo 17. Any astronauts on the moon at that time would have died from radiation. As NASA's new lunar missions progress, the threat of radiation still looms. by EricFromOuterSpace

On planets or the moon: Underground. Dirt and rocks make for good radiation shielding. On spacecraft that fly for long (such as to Mars) probably water tanks. Water is also an ok radiation shield. Not as good as a dense metal, but it's also something you will need to bring anyways.

There is also an electromagnetic radiation shield NASA is working on. I think there were some news on it about a year or so ago.

3

gaunt79 t1_j6ooewc wrote

Reply to comment by ShedDoor2020 in NASA and DARPA to partner on nuclear thermal propulsion demonstration by returnofjuju

Liquid hydrogen takes the place of water in a terrestrial reactor. The hydrogen is pumped into the reactor core (cooling the nozzle and reactor casing on its way) where it is superheated. It then passes to the nozzle, where it expands and is focused into the thrust plume that propels the spacecraft.

This diagram may make more sense.

2