The question Two 1000 kg gold spheres orbit their CM in near-contact, great way to measure G or limited by spaceflight issues? was put on hold for being off topic. It seems that using a spacecraft to measure gravity is beyond the reach of what five users feel to be on-topic.
I've scoped the question carefully to make sure it is about spacecraft design. There are plenty of spacecraft that uses lasers and cameras, there are hundreds of answers that invoke the gravitational constant G, and the design, construction of experimental scientific satellites, and problems like propulsion, nutation and charging are each discussed in several questions and answer here.
Certainly a careful review of all the up votes, accepted answers, and general participation of the community here in the physics-based questions linked below show that we are not afraid of physics here, and that spacecraft physics is squarely on-topic.
So why is my question so far off-topic that nobody should be allowed the opportunity to post an answer here?
I have indeed asked the fundamental physics part of this question in Physics SE:
my current question is focused on the spacecraft design and space environment issues, and after asking over 1,200 questions in this site I can say that I have a pretty good idea how smart the people are here and how well they can handle questions on the physics of spaceflight.
Question: Is this question really, truly off-topic while all of these other physics questions are on-topic?
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- Atomic (Quantum) Inertial Sensor not yet answered
- How does QUESS, China's quantum communications satellite experiment, relay entangled signals?
- Local expansion measured, near zero via Lunar Ranging - what about deep space probes?
- How, and How Well will Juno measure the effects of frame dragging? (GR effect due to Jupiter's mass & rotation)
- Is there any stable orbit around a black hole?
- Besides retarded gravitation, anything else to worry about when calculating MU69's orbit from scratch? Will Parker Solar Probe's orbit eventually circularize?
- Would there be any benefit to sending a probe to a black hole?
- If we can make an Alcubierre drive, how fast can it move a ship?
- Could black holes be used for swing-by?
- Is GR required to send a probe to Mercury?
- Is warp drive a legitimate avenue of scientific investigation?
- Alcubierre Drive and interacting with matter
- How to calculate the planets and moons beyond Newtons's gravitational force?
Faster Than Light (Special Relativity):
- Techniques for digital superluminal communication
- Does the detection of gravitational waves prove we can travel faster than the speed of light?
- Hypothesized parameters of reactionless drives
- “Magic Space Unicorns” disproven? Any technical write-ups of the explanation of Em-Drive results presented at Space Propulsion 2018?
- The “Em Drive” paper is out - need some help understanding it
- What is the current status of EmDrive engine?
- EM drive requirements
- Why is the “impossible” space drive impossible?