NASA discovers black hole with 'heartbeat'

Houston: Soon after finding the largest black hole last week, NASA has now found another black hole, but it is the tiniest one and with a heart beat. 

A NASA satellite has detected what astronomers said was a "heartbeat" of what could be the smallest known black hole. 

The star-sucker could weigh less than three times the mass of the sun, placing it near the minimum mass required for a black hole to be stable. 

Using the NASA's Rossi X-Ray Timing Explorer (RXTE), which detects X-rays coming from cosmic sources, a team of astronomers identified a specific X-ray pattern, nicknamed a "heartbeat", that indicates that a black hole is present in a binary system with the ordinary star.