NASA Earth

In a tsunami, every minute counts. NASA’s GUARDIAN system detected clues minutes after the 2025 Kamchatka earthquake and tracked signs of the tsunami as it sped across the Pacific Ocean. This technology could give communities more time to prepare. go.nasa.gov/4t9DKF4

Hail yes! 🌧️🧊 See hail in your backyard? Report it and help NASA study how hail melts. Your observations make real science possible! Join: go.nasa.gov/41hpgqu

Learn more about equinoxes: science.nasa.gov/solar-system/s…

Spring is here in the Northern Hemisphere! 🌸 Today is the spring equinox. Because Earth is tilted on its axis, the Northern and Southern Hemispheres receive changing amounts of sunlight throughout the year. At the equinox, both hemispheres receive the same amount of sunlight.

Happy vernal equinox! 🍀 Today marks the first day of spring in the Northern Hemisphere and the first day of autumn in the Southern Hemisphere. After today, the Sun will shine more directly on the Northern Hemisphere than on the Southern Hemisphere until the autumnal equinox.

@NASA @USNRL GPS III SV-09 isn’t the only satellite that uses this technology. Earth observing satellites like ICESat-2, SWOT, and GRACE-FO also rely on laser ranging technology. Learn more: science.nasa.gov/centers-and-fa…

Whether walking, driving, sailing, or flying, GPS technology helps people know where they are and get where they’re going. A @NASA & @USNRL instrument on board the recently launched GPS III SV-09 satellite will help improve location measurements.

Go looking for green, and you may find the whole rainbow! 🍀🌈 @NASA's PACE satellite was designed to monitor the ocean and atmosphere, but it's giving us a whole new way to see plants on land.

Learn more about this image: science.nasa.gov/earth/earth-ob…

Happy St. Patrick’s Day! 🍀 Are you wearing green today? Ireland sure is! In this Landsat image, folded limestone forms swirls of gray amidst the shades of green near Ireland’s west coast.

This is the Burren region in western Ireland! Did you guess correctly? Learn more about this image: science.nasa.gov/earth/earth-ob…

Ready for a puzzler? 🧩 This satellite image shows a place on our planet. Can you tell where it is? We’ll share the answer tomorrow morning (March 17) at 11am ET.

Mood: going with the flow 🌀 Swirling patterns in Cañon Fiord were revealed during the 2022 summer melt season, when broken sea ice and sediment traced eddies in the water. Landsat 8 captured the swirls from space. go.nasa.gov/4bxOfuz

We're irrationally excited for Pi Day! 🥧 This week's NASA EXPRESS has a plate full of STEM resources to help you celebrate our favorite irrational number on 3.14. Dig in here: conta.cc/4un7pMg

Astrobiologists also point to the lake as a possible analog for the type of environment where life might have formed or survived on icy moons with oceans such as Europa and Enceladus. More ⬇️ go.nasa.gov/4lryg5Q

What’s so unusual about this lake? 🤔 Lake Unter-See in Antarctica contains cone-shaped microbial reefs resembling some of Earth’s oldest fossils, which create high levels of dissolved oxygen under the ice. NASA’s Landsat 9 captured this image on Feb. 16, 2026.

@NASA Studying geologic features on Earth helps NASA scientists understand similar structures on other worlds. It also allows scientists to test field equipment and techniques here on Earth before using them to explore other worlds! Learn more: go.nasa.gov/4bHlR9x

@NASA This is Mars! NASA's Mars Reconnaissance Orbiter captured this image of Ulysses Colles, an area that also has scoria cones and lava flows.

Both Earth and Mars have been shaped by volcanic activity, creating some similar geologic features on each planet. One of these images shows Earth and the other shows Mars. Can you tell which is which? 🤔