Collision Course

Occultations, eclipses
Jupiter's satellites
Telescopic observations
Stellar phenomena
Surveying the heavens above!

Astronomical, meteorological
Exploring, mapping
Auroral observations
Atmospheric refractions
(double) meridian altitude
Longitude, lunar distances
Altitude of a star - the Sun!

Attitude of the indefatigable
Tadpole, Andromeda galaxies.

Nautical almanac, surveys
Ephemeris generator
Eclipse of the Sun, Moon
Lunar occultations
Co-ordinates of Greenwich House.

Celestial zoo - Elephant Trunk Nebula
Mare Serenitatuis, Veil Nebula.

Bipolar planetary nebula
Ascension, declination, distance.

An image of the interacting pair NGC2207/IC2163. A distant observer on another galaxy might see something like this in 3 billion years when our galaxy merges. - www.stsci.edu


Interacting Galaxies early in the universe -- Credit: Kirk Borne (Raytheon and NASA Goddard Space Flight Center, Greenbelt, Md.), Luis Colina (Instituto de Fisica de Cantabria, Spain), and Howard Bushouse and Ray Lucas (Space Telescope Science Institute, Baltimore, Md.) and NASA.

A Simulation of the Milky Way/Andromeda Collision It is fun and instructive to see how the collision of the Milky Way with Andromeda might play itself out. Here is the sequence of images from a numerical simulation of the collision computed using Blue Horizon a 1152 processor IBM SP3 at the San Diego Supercomputing Centre. Each spiral galaxy is represented by about 40M stars and is surrounded by a 10M particle dark matter halo for a total of more than 100M particles for the galaxy pair.

Nature's collusion;
Collision!

c. 2009 Rita Rosenfeld