Gravitational Microlensing Resulting from Planetary-Mass Objects in a Globular Cluster

Globular Cluster M22 (inset shows entire cluster)

Piercing the heart of a glittering swarm of stars, NASA's sharp-eyed Hubble Space Telescope unveils the central region of the globular cluster M22, a 12- to 14-billion-year-old grouping of stars in the constellation Sagittarius. The telescope's view of the cluster's core...

Inside Globular Cluster M22

Ground-based: NOAO

Alignment of Hubble, Star Cluster and Galactic Bulge for Microlensing Observation

This is a stylized view of a unique Hubble Space Telescope observation to search for low-mass objects residing in the core of the globular star cluster M22 (white clump of stars near image center). Because the objects are too dim to see directly, astronomers used Hubble's sharp...

Animation of Gravitational Microlensing

Animation begins outside a globular star cluster similar to M22, with the center of the Milky Way in the distance. The camera flies through the center of the cluster and rests with a dark object in the distance. This object, a suspected brown dwarf, passes in front of a star in...

Zoom in to Globular Cluster M22

Sequence begins with a ground-based view of the center of our galaxy in the upper right. Zoom in to reveal a ground-based view of the region surrounding the cluster, continue zooming to reveal the Hubble Space Telescope view of M22.

Interview with Dr. Kailash Sahu: Part 1

Interview with Dr. Kailash Sahu: Part 2

Interview with Dr. Kailash Sahu: Part 3