GOES 1 - 16: Geostationary Operational Environmental Satellites.
CYGNSS-1-8: Cyclone Global Navigation Satellite System 1.
DSCOVR: Deep Space Climate Observatory first continuous daytime observations from L1. SMAP: Soil Moisture Passive Active first NASA soil moisture satellite. OCO-2: Orbiting Carbon Observatory-2 first high-precision global measurements of CO2. GPM: Global Precipitation Measurement first near-global precipitation observations. Aquarius first dedicated sea surface salinity measurements. Cloudsat synergistic cloud observations from 2 spacecraft. CALIPSO: Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation first global survey of cloud and aerosol profiles from 2 spacecraft. ICESat: Ice, Cloud,and land Elevation Satellite first continuous laser-altimetry of Antarctic/Greenland ice sheets. Aqua first spacecraft in Afternoon train (A-train). GRACE: Gravity Recovery and Climate Experiment first mission to map Earth's gravity field over time. SRTM: Shuttle Radar Topography Mission first near-global data set of land elevations. Terra first spacecraft of Earth Observing System (EOS). TRMM: Tropical Rainfall Measuring Mission first 3-d views of storms from space. SeaWiFS: Sea-Viewing Wide Field-of-View Sensor first to measure global biosphere. 
TOPEX/Poseidon: Ocean Topography Experiment first in a series providing continuous record of global sea levels. ERBS: Earth Radiation Budget Satellite ozone data was key in Montreal Protocol Agreement. Skylab first combined active/passive microwave sensor (RADSCAT). Landsat-1 first in a series providing continuous coverage of Earth's land. Apollo-8 first humans to orbit Moon Earthrise photo. 
ATS-1: Applications Technology Satellite first full-disk Earth images from geosynchronous orbit. Nimbus-1 first in series that provided 30 years of Earth observations. Vanguard-1 first solar-powered satellite. Explorer-1 first satellite launched by US. The following missions are highlighted in green as "firsts": Twenty-four of these missions are called out as "firsts" in various ways. These missions include both NASA-run missions as well as missions run by organizations that NASA has partnered with. This visualization shows the orbits of NASA-related near-Earth science missions from the launch of Explorer-1 in 1958 through 2017. Janumarks the 60th anniversary of the launch of the Explorer-1 spacecraft and 60 years of Earth observations from space.
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