The company now has three e-commerce sites: telescope.com, livesciencestore.com (weather instruments and robotics) and starrynight.com (software and DVDs).
Hurtling towards the stratosphere the balloon was fitted with weatherinstruments designed to measure, among other things, temperature, pressure and wind speed.
The cellist also played as part of a quartet at President Obama's inauguration in 2009, although it was later revealed the musicians had played along to a pre-recorded track, after fears that cold weather would damage their instruments.