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There is no such thing as "doesn't happen" or "zero chance of something happening". All probabilities of falling debris injuring a human are calculated, expressed in mathematical terms and kept within agreed bounds. FAA will not issue a license otherwise.

It is not understood how primordial hydrogen clouds could shed heat so fast and collapse quickly enough to account for the observed number of SMBHs as far back as Webb can see.

I had the honor of being the manager of the first machine in P&G that got an electronic controller, it was a Honeywell TDC-2000. Until 1979, every process in the company was contolled by pneumatics. We installed a 3 layer headbox for production of layered bathroom tissue, strong fibers on the...

I programmed an IBM360-70 while taking CompSci 101 in 1970. it occupied a whole building. The only input was a card reader. The only output was an 80 column line printer. It never occurred to me that a computer could be made small. If someone suggested having a computer in my dorm room I would...

Group 3685 is coming into view. Next two weeks could be active.

I'm no expert but here is how I look at "extra dimensions". There are only 3 dimensions needed to describe a volume, but a fourth, time, is also helpful. People who need extra dimensions to describe volume are not adding any volume that we could magically use, they are adding dimensions whose...

It is fair to say there simply was no time before t=0. Prior to 10^-43 second, the energy of each particle is sufficient to make it into a separate black hole. Black holes cannot communicate with each other. We have no physics to describe it. It is also theorized that the creation of mass at t=0...

There is always talk of "subspace" or "extra dimensions" within which another universe might exist. We cannot prove that something does not exist somewhere, but if there was a "folded dimension" with hidden mass, we would see its gravity.

We live in a cosmic shooting gallery, the more warning we have the better chance we have of intercepting something. Some of these bodies come from outside the Solar System, acellerated towards us by unknown forces. They could basically come in with whatever speed they started at. We need...

They say there is a lot of ice in Saturn's rings. Ice is mega valuable to spacefarers. Drinking water, fuel, water balloons, etc. Plus they would not have to go down the planet's gravity well so far, the chunks are of manageable size, a great view for a bar or lounge, low taxes. I'm in!

There are conventions in Electrical Engineering that we use to make sure the motors turn in the correct direction. They are the left hand rule for electrons and the right hand rule for positive charges. There is also a general rule that any motion of a magnetic field through a conductor results...

Space is a great place to get rid of toxic wastes as long as you can assure they keep on going and don't intersect Earth later. Deep space is also better for microgravity experiments. LEO has some level of tidal forces that super delicate crystalizations might not like.

A net negative charge on the equator traveling eastward will generate a magnetic field pointing to the north geographic pole. This is opposite to reality. Our planet's north geographic pole is the south pole of a magnet. The north pole of a magnet being defined as that pole which points to the...

What could possibly be a valid, profit making, enterprise in interplanetary space? Maybe a bit of tourism. You might sell space rocks. Precious metals can't pay their own way with current rocket ship technology. Maybe crash a solid nickel asteroid on the Earth somewhere. EPA might have a problem...

Looking down on a charged metal disc that rotates about the central axis clockwise will generate a magnetic field similar to Earth's, with south on top and north on bottom as viewed from outside. On the disc, a given charge will not see the charge around it moving, but it will see the charges at...

I looked at the original paper and the image in this article has North on top, South on bottom, East is to the left, West to the right.

A charged particle sitting on the edge of a record would indeed cause a dipole field similar to Earth's. Earth's field can be approximated by a flow of electrons on the Equator traveling east to west.

You are correct: A current will occur when one area of static charge moves through a conductor to neutralize another area, that one of opposite charge. A current can also be generated by chemical action and sent through a conductor. A current is generated any time any conductor moves across a...

It is true that there are permanent magnets that don't need an electrical current. However, there is an absolute dictum in physics. A magnetic field can only be produced by a moving charge. This is what got Einstein to formulate Special Relativity. He could not understand why the magnetic field...

Look at the video at 00:25. The flare occurs and totally overloads the sensors, all we see is a wall of light. But, the camera lens is compound and there are internal reflections off to the side at far lower amplitude. Detailed structure can be seen, showing the area of interest is two tiny...