All Questions
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0answers
7 views
Protecting technology from radiation on mars
Mars hasn't got a very strong magnetosphere. I often read that even equipment and technology needs to be protected against the radiation.
My question:
How do they protect the equipment from ...
2
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0answers
26 views
What material is the Merlin 1D made from?
I am working on high school presentation about rocket engine materials and I'd like to have a part about Merlin 1D engine as it is supposed to be reusable, but I can't find anything about materials ...
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0answers
14 views
What is the sequence of the main spacecraft and CubeSats separation during Falcon 9 launch?
I'm curious about timeline and the procedures related to the spacecraft separation during Falcon 9 (and perhaps other rockets if such information is available) launch.
Let's assume a mission with one ...
1
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1answer
14 views
Mapping the moon: how to use the Lunar Recognizance Orbiter (LRO) image data?
what's the meaning of Scaled pixel width and scaled pixel height of LROC EDR image obtained by LROC image search tool?
1
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0answers
8 views
Muscle loss in space
Since loss of muscle is such a big problem in extended space travel I wondered (and practicalty is a different issue) if astronauts could maintain muscle mass by donning oxygen masks and playing a ...
1
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0answers
16 views
Comparison between solid rocket fuels. Which are better by performance and cost?
I am interested for a comparison of solid rocket fuels by their performance and cost. Comparison by specific impulse (Isp), energy that gives (which one is more energitic), density, cost to ...
1
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0answers
16 views
How accurate can near earth asteroids by tracked?
To get more statistical significance for the suspected flyby-anomaly (or to refute it), it would be desirable to track as many hyperbolic earth flybys to within 1mm/s as we can get. Can we track ...
0
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0answers
41 views
Pioneer spacecraft anomaly
Has the possibility of the "Pioneer Anomaly" as caused by currently inadequate conceptual models of gravity been put to rest by explaining it as caused by on board thermal radiation ? What is the ...
3
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0answers
45 views
Has DSS-43 ever been used in high power mode (>>20 kW) for an emergency situation?
This answer notes that while most Deep Space Network transmitters are 20 kW of power or less, one dish (DSS-43 in Canberra) is equipped with a transmitter capable of 400 kW.
Explained in 101, 70-m ...
2
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1answer
49 views
When was the second production run of the Saturn V cancelled?
The Saturn V had an initial production run of 15 vehicles (plus 3 test articles). Twelve were used for Apollo 4, 6, and 8-17, one was used for Skylab, the components of the other two are on display in ...
3
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0answers
15 views
Earth-Mars Radio Blackout: Is it possible to define an extended solar radius to solve this as a geometric problem?
Solar atmosphere causes difficulties in communication during opposition (when Mars is almost behind the sun w.r.t. Earth).
The question is: is it possible to define an extended radius for the sun, ...
3
votes
1answer
158 views
Is the fastest way to Mars a solar flyby?
The recent question Launch windows to Mars got me thinking. Why is there only one or two launch windows to Mars ever other year?
If you leave Earth heading for the sun, you should get a gravity ...
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0answers
53 views
Why does the YF-75D nozzle material have such a strong spiral pattern?
Why does the YF-75D nozzle material have such a strong spiral pattern?
Is it a result of manufacturing? Or added later? If it was only on the inside, I could imagine it was something to address ...
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2answers
55 views
First launch of Long March-5 using 4 RP-1/LOX boosters. First use of RP-1/LOX LRBs?
The Long March 5's first launch used a LH2/LOX main engine with four RP-1/LOX Liquid Rocket Boosters (LRBs). Is this the first time that RP-1/LOX LRBs have been used in a successful launch to orbit?
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1
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1answer
89 views
CZ-5 plus YZ-2 put SJ-17 in GEO - third stage or separate spacecraft?
CZ-5 = Long March 5
YZ-2 = Yuanzheng 2
SJ-17 = Shijian 17
Gunter's Space Page says:
SJ 17 (Shijian 17) is a Chinese experimental satellite flown on the maiden CZ-5/YZ2 launch.
It is ...
