Recent content by scibuff

Actually, the twin paradox lies in a fact that, suppose if the twin A traveled at \frac{\sqrt{3}}{2}c - so that \gamma=\frac{1}{2} for a year and then turned around and came back (at the same velocity), twin B would have aged 2 years and twin A only one year. But if you looked at the situation...

I was really replying to the , but quoted the wrong part of the post :D, my bad

The 3mm part is obviously non-sense. Earth's distance from the Sun changes throughout the year by about 5 million km (from 152 mil km at aphelion in early July to 147 mil km at perihelion in early January). The circumstellar habitable zone within our solar system is from about 0.95 AU to 1.37...

Pressure p, is defined as a force F exerted on area A, that is p = F / A. The force F is really just the force of gravity of the column of water above you, which can be calculated as mg (where m is the mass of the water and g is Earth's gravitational constant). The mass of the water is give by m...

... stationary with respect to what? If you mean with respect to Earth ... the only option would be one of the Lagrangian Points (L4 or L5) in the Sun-Earth system. There are also L4 and L5 points in the Earth-Moon system but they are not very stable due to gravitational influence of the sun...

I guess i should have been clearer ... whenever two observes disagree on the time measured, they will always disagree on the length as well. That's what I meant by saying that length contraction and time dilation happen at the same time - which one of the two you see depends on your frame of...

Alcubierre's drive does NOT allow velocities greater than c. What it does (in a nutshell) is it affects the space-time so that the distances are (much much much) shorter. But locally, within the warp-bubble, you don't travel faster than light. In fact, a traveler inside the warp bubble...

actually, time dilation and length contraction happen at the same "time", it really depends on the way you look at it (distance = velocity * time so if time is shortened, so is the distance)

Just to add some numbers: Apollo 13 re-entred the Earth's atmosphere at 11.037 km/s (http://history.nasa.gov/SP-4029/Apollo_13a_Summary.htm) at the altitude of 121.9 km. The escape velocity for the Earth's SURFACE is 11.186 km/s but only 11.075 km/s at the point of the re-entry. You are...

actually what a warp drive does, in a nutshell, is that it creates a bubble by deforming the space-time so that the distances are (much much much much) shorter - within the bubble you would still travel at speed less than c and you would actually be in a state of free fall thus dealing with a...