The very successful exoplanet finding spacecraft Kepler continues to have problems with a reaction wheel. If it fails this will cripple the mission if not end it completely: Kepler reaction wheel still problematic after mitigation – Spaceflight Now
The very successful exoplanet finding spacecraft Kepler continues to have problems with a reaction wheel. If it fails this will cripple the mission if not end it completely: Kepler reaction wheel still problematic after mitigation – Spaceflight Now