the globular cluster Palomar 5 orbits the Milky Way and is stretched by tidal forces. on what time-scale would the tidal arms reach all around the Milky Way?
Wednesday, November 26, 2014
Wednesday, November 19, 2014
the Planck-spectrum is dominated by Boltzmann-statistics at high energies and by Bose-statistics at low energies. could you estimate how much solar power we receive per unit area at Earth from the quantum-mechanical part of the Sun's spectrum?
Eingestellt von spirou um 11/19/2014 12:00:00 AM
Wednesday, November 12, 2014
earlier this year there was a question about the gravity train to New Zealand. a passenger would feel two kinds of tidal forces: firstly, there's a differential gravitational field between head and feet, and secondly, the shoulders would each follow trajectories pointing towards the Earth's centre. which of the two effects is larger?
Eingestellt von spirou um 11/12/2014 12:00:00 AM
Wednesday, November 5, 2014
imagine there would be a planet identical in mass as our Earth circling the Sun in our orbit with a lag of exactly 6 months, i.e. it would always be behind the Sun and not directly visible for us. would there be nevertheless possibilities of detecting it?
Eingestellt von spirou um 11/05/2014 12:00:00 AM