The theory was experimentally verified four years later when a team led by British astronomer Sir Arthur Eddington measured how much the suns gravity deflected the image of a background star as its light grazed the sun during a solar eclipse, an effect called gravitational microlensing
The gravitational microlensing
method data provide a solid estimate of the white dwarf's mass and yield insights into theories of the structure and composition of the burned-out star.
This also explains how light curves around objects and acts as a lens for what's behind it, called gravitational microlensing
This gravitational microlensing
was seen in 1919, when starlight curved around a total eclipse of the Sun.
An investigation of the amount of planetary-mass dark matter detected via gravitational microlensing
concluded that these objects only represent a small portion of the total dark matter halo .
Their technique, called gravitational microlensing
, takes advantage of chance alignments between stars.
Planet surveys using the gravitational Microlensing
technique (page 21) achieved the first meaningful result about planet frequency, finding that each single solar-mass star in our galaxy hosts, on average, one or more planets in an orbital range of 0.
Chapter 4 comprises an account of the earliest successful discoveries, followed by Chapters 5-10 dealing with the observational techniques involved: radial velocity measurement, transit phenomena, direct imaging, gravitational microlensing
and precise timing methods to identify planetary companions.
Unlike other types of planet searches, this technique, called gravitational microlensing
, works well for stars both near Earth and far away.
In addition, I briefly discuss the next step in observational asteroseismology: the SONG network which is designed to make ground-based velocity observations of stellar oscillations, and detect exoplanets from gravitational microlensing
, from 7-8 nodes suitably distributed around the world.
MicroFUN astronomers use a method called gravitational microlensing
, which occurs when one star happens to cross in front of another as seen from Earth.
Memorial and biographical talks are followed by presentations on black hole accretion disks, the All Sky Automated Survey, cosmic dark matter and gravitational microlensing
, the Optical Gravitational Lensing Experiment, Paczynski's contributions to understanding gamma ray bursts, and the place of Paczynski in the history of astronomy.