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Apr
12
awarded  Enlightened
Apr
12
awarded  Nice Answer
Mar
8
comment Orbits in a binary star system
@DylanSp Thanks a lot! This paper is unambiguous. I've adjusted the answer.
Mar
8
revised Orbits in a binary star system
Correction regarding the stability condition for Lagrangian points L4 and L5
Mar
3
comment Orbits in a binary star system
@DylanSp That's a good point. However, if the paper you referenced is read with a strict mathematical interpretation, it says "This will be true if", not "This will be true iff", with "iff" meaning "if and only if". So I'm not sure, whether the conclusion in the other direction holds. The figure on page 2 of the paper I referenced, shows a minimum for L4 and L5 in the equal-mass binary case. Out of the hip, I can't decide which interpretation is correct.
Mar
2
comment What planets and moons have we seeded with life (if any)?
You may be able to refine your answer by studying NASA's planetary protection website: planetaryprotection.nasa.gov/missions
Mar
2
awarded  Revival
Mar
2
awarded  Revival
Feb
22
reviewed Approve Why do (most of) the planets rotate counterclockwise, i.e. the same way the Sun does?
Feb
21
comment What is the current state of gravity in the vacuum of space?
Strictly speaking, negative energy isn't exactly vacuum, but less than that, since not all vaccum quantum fluctuations are allowed. For kinetic energy you need a system of reference.
Feb
21
reviewed Close Origin of the Universe
Feb
21
reviewed Leave Open What is the current state of gravity in the vacuum of space?
Feb
21
answered What is the current state of gravity in the vacuum of space?
Feb
19
answered Problem with denoising the BICEP2 data?
Feb
19
comment Are black holes really singularities?
Well, wormholes (Einstein-Rosen bridges) would be consistent with General Relativity, and without need for singularities. But they may be instable for other quantum theoretical reasons, at least when assembled as a macroscopic "time-machine". Kip Thorne once discussed this in his book "Black Holes and Time Warps" in rather detail: en.wikipedia.org/wiki/Black_Holes_and_Time_Warps
Feb
19
answered Are black holes really singularities?
Feb
10
comment Does earth's Umbra reach Sun-Earth L2?
Yes, the probe would see a ring around the Earth. like an annular eclipse. en.wikipedia.org/wiki/Solar_eclipse#Types
Feb
10
revised Does earth's Umbra reach Sun-Earth L2?
added some detail regarding accuracy of the calculations
Feb
10
answered Does earth's Umbra reach Sun-Earth L2?
Feb
10
reviewed Reviewed Is the moon moving further away from Earth and closer to the Sun? Why?