THE SEARCH FOR MACHOS: Among the first observations made with the VATT were time sequence images of the nearby galaxy in Andromeda, M31. Multiple images of fields were compared seeking variations in the brightness of individual stars caused by Earth-to Sun-sized bodies in the halo of M31 passing between VATT and the star. Such a Massively Condensed Halo Object (MACHO) will brighten the image of the star as its gravity bends and focuses the light of the star toward the observer. These "microlensing" events reveal otherwise invisible MACHOs, thought to be part of the 90% of a galaxy's mass that does not shine, but exerts a gravitational force on the stars of the galaxy, making it rotate faster than can be accounted for by the glowing matter: In the more than 7 years of the project, microlensing events indicating MACHOs around the size of the Sun have been detected in our neighbor galaxy.