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7h
comment Why do meteorites explode?
I'm completely sure that if a pretty solid (iron) meteorite is shaped in such a way that the air makes it enter a violent spin, the berak-up will be anything but gentle. But I have no clue how often this could occur.
12h
comment Why do meteorites explode?
@rob: sometimes the break-up is quite non-violent. But in case of Chelyabinsk there was heavy damage to ground infrastructure, many wounded people - is that all result just of the (continuous, lengthy) shock front reaching the ground?
1d
asked Why do meteorites explode?
Apr
12
reviewed Reject Why does Jupiter have so many moons?
Apr
4
comment Which class of objects in Solar System carries more mass?
@Andy: Primarily, a clue what the total mass of interplanetary medium, and the total mass of all the "rubble" is, compared to the planets. Are the planets actually the biggest concentration of mass in the Solar System (other than the Sun of course) or are they merely the biggest concentration of mass...
Apr
4
comment Which class of objects in Solar System carries more mass?
@Andy: still far from the mass of Jupiter. Also, the difference may come from including/excluding Oort cloud objects: gas alone, or gas+asteroids+dwarf planets.
Apr
4
comment Which class of objects in Solar System carries more mass?
Inspired by this factoid: "there's roughly as much humans as ants on Earth, by mass."
Apr
4
asked Which class of objects in Solar System carries more mass?
Mar
22
accepted How big do comets get?
Mar
21
asked How big do comets get?
Feb
27
accepted Do massive bolide entries coincide with meteor showers?
Feb
27
awarded  Custodian
Feb
27
reviewed Approve Do massive bolide entries coincide with meteor showers?
Feb
27
asked Do massive bolide entries coincide with meteor showers?
Feb
19
comment Does LIGO have a blind spot?
@JamesKilfiger The TauTona Mine or Western Deep No.3 Shaft, is a gold mine in South Africa. 3.9 kilometers. And the value would be in making it a self-contained full 3D gravitometer, but I guess it IS easier just to build another surface facility far enough for Earth's curvature to kick in to provide the change of plane of operation.
Feb
18
comment Does LIGO have a blind spot?
@JamesKilfiger: Building a 4km mine shaft is a routine work though.
Feb
18
accepted Does LIGO have a blind spot?
Feb
18
comment Does LIGO have a blind spot?
@FlorinGhita: I believe it would about triple the price, three pairs of laser beams instead of one. It isn't just "adding a third beam" but "adding two new gravitometers".
Feb
18
asked Does LIGO have a blind spot?
Feb
10
comment Does earth's Umbra reach Sun-Earth L2?
Thank you. That means a satellite at L2 will never be fully shaded from the Sun.