Get ready to witness a groundbreaking moment in space exploration! Three nations, three missions, one rocket launch—this is not your average satellite deployment. But here's where it gets even more fascinating: these missions are set to revolutionize how we monitor our planet’s most precious resource—water—while also boosting national capabilities in Earth observation and disaster management. And this is the part most people miss: the innovative technologies and international collaborations that make it all possible.
On Wednesday, November 19th, at 19:18 CET (10:18 Pacific Time), the European Space Agency’s (ESA) HydroGNSS mission, a twin-satellite project designed to study Earth’s water cycle, is scheduled to launch from Vandenberg Space Force Base aboard a SpaceX Falcon 9 rocket. Live coverage begins at 19:01 CET (10:01 Pacific Time) on ESA Web TV. But that’s not all—this rideshare launch also includes satellites for Italy’s IRIDE mission and Greece’s National Small Satellite Programme, developed by ICEYE. Mark your calendars, because launch times can change unexpectedly, and you won’t want to miss this historic event!
HydroGNSS: Scouting for Water
Did you know that changes in the global water cycle are one of the most pressing environmental challenges of our time? HydroGNSS, part of ESA’s FutureEO programme, aims to tackle this head-on by monitoring four critical hydrological parameters: soil moisture, inundation or wetlands, freeze/thaw state, and above-ground biomass. These aren’t just random metrics—they’re closely tied to Essential Climate Variables, which scientists use to assess climate risks and inform applications like weather forecasting, flood prediction, and permafrost monitoring. But here’s the kicker: HydroGNSS doesn’t just stop there. It also measures wind speed over oceans and sea-ice extent as secondary products.
So, how does it work? The mission uses a technique called Global Navigation Satellite System (GNSS) reflectometry. Here’s the science behind it: GNSS satellites like Galileo and GPS constantly transmit low-power microwave signals to Earth for navigation. When these signals bounce off the Earth’s surface, they carry information about terrain, ice, oceans, or vegetation. HydroGNSS compares these reflected signals with the original ones to gather data on the water cycle. It’s like reading a story written by the Earth itself—and this mission is the interpreter.
The HydroGNSS mission consists of two microsatellites, orbiting 550km above Earth, 180 degrees apart, each equipped with a GNSS reflectometry instrument. It’s a testament to how innovative technology can unlock new ways to understand our planet.
Italy’s IRIDE: A Constellation for Earth Observation
Now, let’s talk about IRIDE, Italy’s ambitious Earth observation programme. This mission is all about providing public sector services using data from its growing fleet of satellites. The upcoming launch includes satellites for Eaglet II, the second of six planned constellations. Each Eaglet II satellite carries a multispectral, high-resolution optical instrument and an Automatic Identification System (AIS)—tools that will support mapping, monitoring, and multi-temporal analysis. These satellites aren’t just for show; they’ll assist Italy’s civil protection department and public authorities in making informed decisions.
But here’s where it gets controversial: As countries like Italy invest heavily in space-based technologies, questions arise about data accessibility and equity. Who gets to benefit from this wealth of information? Should it be shared globally, or is it a national asset? We’d love to hear your thoughts in the comments.
Greece’s Leap into Space: The National Small Satellite Programme
Greece is making its mark in space with the launch of two high-resolution ICEYE radar satellites, the first under its National Small Satellite Programme. This initiative aims to enhance Greece’s satellite technology, drive economic growth, and strengthen capabilities in disaster management, environmental monitoring, and security. Led by the Hellenic Space Center and the Greek Ministry of Digital Governance, with ESA’s support, this programme is a prime example of how smaller nations can punch above their weight in the space sector.
Why This Launch Matters
This launch isn’t just about satellites—it’s about global collaboration, innovation, and addressing some of the most pressing challenges of our time. From monitoring climate change to improving disaster response, these missions showcase the power of space technology to transform lives. But as we celebrate these achievements, let’s also ask ourselves: Are we doing enough to ensure that the benefits of space exploration are shared equitably across the globe?
Join the conversation below—we want to hear your opinions on the future of space exploration and its impact on our world. And don’t forget to tune in to the live webcast on November 19th. This is one event you won’t want to miss!
