ICESat

ICESat (Ice, Cloud, and land Elevation Satellite) is a NASA satellite launched in 2003 to measure the Earth's ice sheets, forests, and land elevation with high precision. It uses laser beams to send pulses of light down to the Earth's surface and measures the time it takes for the light to return. This data helps scientists track changes in ice sheets, monitor sea level rise, and study Earth's topography over time, providing critical information about climate change and environmental health.