Measuring the Mass of a Single Star

In the image at top, left, astronomers discovered a subtle brightening of a star [located within the box] due to the effect of gravitational microlensing. This phenomenon occurs when a foreground star, in this case a dim red star, passes in front of a much more distant star and amplifies its light. Astronomers were engaged in a large-scale search for microlensing events in the halo of our Milky Way galaxy. They were looking in the direction of the Large Magellanic Cloud, a satellite galaxy of our Milky Way. The image was taken in February 1993 with the 50-inch telescope at the Mount Stromlo Observatory in Australia. The box represents the field of view of NASA/ESA Hubble Space Telescope.


NASA, ESA and D. Bennett (University of Notre Dame)

About the Image

NASA press release
NASA caption
Release date:14 April 2004, 19:00
Size:3000 x 2400 px

About the Object

Name:MACHO-LMC-5 1994
Type:• Milky Way : Star
• Milky Way : Cosmology : Phenomenon : Lensing
• Local Universe : Star
• X - Stars Images/Videos

Image Formats

Large JPEG
633.6 KB
Screensize JPEG
161.8 KB


Colours & filters

606 nm Hubble Space Telescope
814 nm Hubble Space Telescope

Notes: This image was captured with the 50-inch telescope at the Mount Stromlo Observatory.

Also see our

Accelerated by CDN77