Reuven Ramaty High Energy Solar Spectroscopic Imager

The probe provided vital clues about solar flare

RHESSI recorded more than 1,00,000 X-ray event

After over 21 years of service as it re-enters the thick atmosphere

Tasked with observing solar flares and coronal mass ejections from the Sun

Launched into Low Earth Orbit (LEO) onboard the Orbital Sciences Corporation Pegasus XL rocket and was pressed into service in 2002

According to the latest projections, the spacecraft is expected to re-enter Earth's atmosphere at 7:00 am on Wednesday.