Basically, if the size of the event horizon(EH) of a black hole is R (radius) can the rate of change of this R or dR/dt be faster than the speed of light(c)?
When it comes to expansion of an EH of a black hole: Does the event horizon immediately expand? For example, if one black hole consumes...
For a real mass-conserved(m dot is constant throughout the system) steady-state mono-substance(same substance throughout) flow , what are the different factors which can cause stagnation pressure and temperature to drop/rise?
There are two examples: A planet rotating around a star and a spacecraft maneuvering through space. Let's assume that solar radiation has no affect on the spacecraft and the spacecraft is not bumping into any stuff, and niether is the planet; and no other gravitational sources are involved...
But as the two black holes come closer, don't their event horizons change shape and size, and perhaps shrink at some radial positions?
And if coming closer increases event horizon size(for all radial positions), wouldn't going away decrease the event horizon size?
http://cdn4.sci-news.com/images/2016/02/image_3628-Gravitational-Waves.jpg
In the above image, i can see that the event horizon of each black hole has decreased in size. Does that mean that the event horizon can shrink in the presence of another black hole?
Resources is one big issue in case of venus. But when it comes to energy, that too solar, venus receives almost 240 times more energy than mars. Plus, we have tons of carbon dioxide to feed ourselves/the plants, there may be several efficient and light technology which can convert carbon dioxide...
Why is it a "strong limitation". I understand that humans are an animal which walk on land and cannot fly, but now we can, and we should.
The venus habitat would sink, no doubt. Such things could be fixed and the venus habitat can be refuelled.
Let me tell you how low the pressure on mars, is...
At the 50km hieght, where pressure outside and inside is the same, the temperature is 0-80 degree celsius. Basically, a human can survive there on venus at 50km longer than on mars' surface. We won't even touch the surface of venus, that's not the aim.
Corrosion isn't as big of a problem as...
Idk where i picked this up, but there is one other plausible colony destination for humans: Venus.
After a few trips on the net, I've come to the "Aerostat on Venus" side instead of a colony on mars. I'll mention some of the reasons I've picked up as to why:
1. Tons of CO2, we can use that.
2...
The test section dimensions:
16x12x39 inches, 39 is the length of section.
The dimensions of delta wing:
Root Chord: 220 mm, Span 160 mm..
At a velocity of 4 m/s and AOA of 27 degrees, we observed one vortex bursting a bit upstream of mid chord and the other vortex bursting at a point just...
Its one of the smallest wind tunnels in the institute, open suction and max 15 m/s. it's got a small test section cross section, like 1 ft squared or something, and its got a 9 contraction ratio.
So, my professor said that its because the navier sokes equation isn't symmetric for high Re flows...
Alright, thank you for your clarifications. So i guess either the wind tunnel had some asymettricities in it or our delta wing might've been placed at some yaw. My doubts have been cleared.