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[[File:lighterstill.jpg]]

[[File:lighterstill.jpg]][[File:Microlensing.jpg|right|frame]]

'''Gravitational microlensing''' is an [[astronomical]] [[phenomenon]] due to the [http://en.wikipedia.org/wiki/Gravitational_lens gravitational lens] effect. It can be used to detect objects ranging from the [[mass]] of a [[planet]] to the mass of a [[star]], regardless of the light they emit. Typically, astronomers can only detect bright objects that emit lots of light (stars) or large objects that block background light (clouds of gas and dust). These objects make up only a tiny [[fraction]] of the mass of a galaxy. Microlensing allows the [[study]] of objects that emit little or no light.

'''Gravitational microlensing''' is an [[astronomical]] [[phenomenon]] due to the [http://en.wikipedia.org/wiki/Gravitational_lens gravitational lens] effect. It can be used to detect objects ranging from the [[mass]] of a [[planet]] to the mass of a [[star]], regardless of the light they emit. Typically, astronomers can only detect bright objects that emit lots of light (stars) or large objects that block background light (clouds of gas and dust). These objects make up only a tiny [[fraction]] of the mass of a galaxy. Microlensing allows the [[study]] of objects that emit little or no light.