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2024 was the warmest year on record. Our experts work with NOAA scientists to track Earth’s average temperature, relying on millions of measurements worldwide. They found this year was hotter than any since at least 1880, the result of human activities: go.nasa.gov/3WdGkvy

Today, we honor the heroes of our program who made the ultimate sacrifice in the name of exploration. Safety remains our cornerstone as their courage continues to inspire our journey to the stars. #NASARemembers

NISAR will observe our planet like no mission before, helping us understand Earth’s changing land and ice surfaces.

Blue puddles of water were visible on the East Antarctic ice shelf after periods of record melting that took place at the end of 2024. These melt ponds are areas where the snow has melted and pooled in low spots on the shelf. Details: go.nasa.gov/3WJgnnN

From severe weather to air quality, tiny atmospheric particles can have a big impact. A #NASAScience-funded team is exploring how metasurface optical elements could enable lighter & smaller space-based instruments to characterize these particles and improve our climate models and

Sea level update 🌊 In 2024, global sea level rose faster than expected mostly due to ocean water expanding as it warms, or thermal expansion. According to a NASA-led study, 2024’s rise was 0.23 in (0.59 cm) per year, compared to the expected rate of 0.17 in (0.43 cm) per year.

Like many glaciers in the Alps, the Great Aletsch Glacier is retreating and thinning. These #Landsat images show change over the past 40 years. The shortening and narrowing of a glacier’s surface area can indicate a net loss of ice mass. go.nasa.gov/4inoZJB

Sea ice update 🌊🧊 Global sea ice hit a record low this winter, NASA and National Snow and Ice Data Center report. In the Arctic, winter sea ice was the lowest it’s ever been at its annual peak this year. The Antarctic sea ice minimum was also the second-lowest on record. More: go.nasa.gov/4j4KpuV

In March 2025, Arctic sea ice hit its lowest annual peak on record. At the other end of the globe, Antarctic sea ice cover was the second-lowest on record that month. That means that, overall, Earth’s sea ice reached a new record low in 2025. 🌊🧊 go.nasa.gov/4j0lgCe

Every day is #EarthDay here at GISS! We study our home planet and the ways it's changing, using satellite data, measurements from the ground and sea, and supercomputers. Join us in celebrating Earth Day as only NASA can: nasa.gov/curiousuniverse