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DSCOVR (for Deep Space Climate Observatory, earlier called Triana) is a satellite located at Lagrangian point L1, monitoring space weather, particularly to give what warning is possible for coronal mass ejections (CMEs), and monitoring Earth climate. It was developed in the 1990s as a project of Al Gore and has had the informal name GoreSat, but the project was canceled after the satellite was constructed, and it was launched in 2015 after the project was revived and continues to operate in 2025 both giving warning of solar storms and collecting data on Earth's emission. Instruments:
Coronal mass ejections hit Earth occasionally, events generally known as solar storms, causing damage, impeding communication and travel, and creating significant auroras. A major one can produce disastrous destruction and upheaval (and such major ones are inevitably going to occur.) DSCOVR can detect one from fifteen minutes to an hour before it reaches Earth (the speed of CMEs varies); warnings earlier than that would be extremely helpful, but at this point, DSCOVR is one of the few satellites in place to produce any warning.