What is the best indicator for asteroids orbit accuracy I am currently working on close approach between asteroids and trying to select 1 million asteroids with the most accurate orbit as given by MPCORB DAT gz file I extracted and analyzed the uncert
Newest date-of-easter Questions - Astronomy Stack Exchange Q A for astronomers and astrophysicists According to Jean Meeus, Astronomical Algorithms, Easter is defined as the first Sunday after the 1st full moon after the vernal equinox The equinox is fixed for ecclesiastical purposes on March 21,
Cooling the early earth - Astronomy Stack Exchange My son had this theory that the icy comets cooled the hot earth during the late heavy bombardment What do we know about this cooling effect on the early evolution of the earth? He intended his the
gravity - How can we see black holes collapse if time inside the event . . . What we see is the surface of the collapsing star becoming progressively more and more red shifted In our space-time frame we don't see matter crossing the event horizon (as an infinite amount of time would have to pass) but we do see that matter becoming red-shifted The amount of red-shifting increases without limit and in seconds even gamma radiation gets red-shifted to radio waves with a
Directions to Proxima Centauri - Astronomy Stack Exchange I'm writing a sci-fi novel in which humans venture to the stars for the first time Their "shake down" cruise takes them to Proxima Centauri I'm trying to understand where Proxima Centauri is loca
Does the twin paradox work in an almost empty universe? Background The twin paradox is the popular thought experiment involving twins, one of whom makes a journey to a nearby star in a high-speed rocket (travelling at a velocity close to the speed of li