Gravitational lensing

electromagnetic radiation as a remnant from an early stage of the universe in Big Bang cosmology

distribution of matter between a distant light source and a observer

image of a quasar

an image of a distant light source (such as a galaxy or star) which has been distorted into a ring through gravitational lensing caused by an object with an extremely large mass (such as another galaxy or a black hole)

galaxy

blue supergiant, the most distant star detected at 9 billion light years from Earth

galaxy cluster

Polish astronomer (1940-2007)

long-term variability sky survey

gravitationally lensed quasar

astronomical phenomenon due to the gravitational lens effect

A1689-zD1 is a galaxy in the Virgo constellation. It was a candidate for the most distant and therefore earliest-observed galaxy discovered , based on a photometric redshift.

galaxy cluster

OGLE-2005-BLG-390L is a star thought to be a spectral type M (a red dwarf; 95% probability, 4% probability it is a white dwarf, <1% probability it is a neutron star or black hole). This galactic bulge star is located in the Scorpius constellation at a far distance of about 21,500 light years, near the border with Sagittarius.

OGLE-2006-BLG-109L (where the last 'L' stands for lens) is a dim magnitude 17 M0V galactic bulge star approximately 4,920 light-years away in the constellation of Scorpius.

OGLE-2005-BLG-169L is a dim and distant magnitude 20 galactic bulge star located about 2,700 parsecs away in the constellation Sagittarius. If it is a main sequence star, then it is most likely a red dwarf with about half of the mass of the Sun. Other possibilities are a white dwarf star, or (less likely) a neutron star or black hole.

Redirect MOA-2007-BLG-192Lb#Host star

measurement of light ray bending from a gravitational lens

astronomical research project

supernova

OGLE-2003-BLG-235L (MOA-2003-BLG-53L) is a star in the constellation of Sagittarius. The first gravitational microlensing event for which a planet orbiting the lens was detected around this star. The event occurred in during July 2003. Two groups observed and independently detected the event: the Optical Gravitational Lensing Experiment (OGLE) and the Microlensing Observations in Astrophysics (MOA), hence, the double designation. It is an orange dwarf star of spectral type K, which is accompanied by a giant planet.

OGLE-2005-BLG-071L is a distant, magnitude 19.5 galactic bulge star located in the constellation Scorpius, approximately 11,000 light years away from the Solar System. The star is probably a red dwarf with a mass 43% of that of the Sun.

effect strong enough to produce multiple images, arcs, or even Einstein rings

MOA-2007-BLG-400L is a star located 22472.1 light-years (6890 parsecs) away in the constellation of Sagittarius. This star is presumed to be a red dwarf with a spectral type of M3V, based on its mass of 0.35 M☉.

thumb|right|300px|SDSSJ0946+1006 gravitational lens SDSSJ0946+1006 is an unusual gravitational lens system consisting of three galaxies at distances of respectively three, six, and eleven billion light years from Earth. In a report presented at the 211th meeting of the American Astronomical Society, researchers Raphael Gavazzi and Tommaso Treu of the University of California, Santa Barbara described the discovery of a double Einstein ring produced by the gravitational lensing of light from two distant galaxies. The observations were made using the Hubble Space Telescope.

variable star

gravitational deflection of light without creating noticeable extra images

network of optical astronomical telescopes used for photometry

PA-99-N2 is a microlensing event detected in the direction of the Andromeda Galaxy in 1999.

Quasar

Gravitational lensing survey

quasar

MOA-2009-BLG-387L is a red dwarf in the Sagittarius constellation that is host to the planet MOA-2009-BLG-387Lb. The star is estimated to be nearly 20,000 light years away and approximately one fifth the mass of the Sun, although large confidence intervals exist, reflecting the uncertainties in both the mass and distance. The star drew the attention of astronomers when it became the lens of gravitational microlensing event MOA-2009-BLG-387L, in which it eclipsed a background star and created distorted caustics, an envelope of reflected or refracted light rays. Analysis of the caustic events an