The final frontier in space exploration might be closer than you ever imagined – and it’s not just about Mars or the Moon. It’s right here, in the very low Earth orbit (VLEO), a region just 60 to 250 miles (100 to 400 kilometers) above our planet’s surface. But here’s where it gets controversial: while this area promises groundbreaking advancements, it’s also a space that’s been largely untapped due to significant challenges. Could VLEO be the next big leap in satellite technology, or is it a logistical nightmare waiting to happen? Let’s dive in.
The Crowded Skies Above Us
Did you know there are already around 15,000 satellites orbiting Earth? Most of them, like the International Space Station and the Hubble Telescope, reside in low Earth orbit (LEO), which extends up to about 1,200 miles (2,000 kilometers) above the surface. But with the rise of mega-constellations like SpaceX’s Starlink, LEO is getting seriously crowded. And this is the part most people miss: VLEO, despite its challenges, could be the solution to this congestion.
Why VLEO Matters
As an engineer and professor working on technologies to expand humanity’s reach beyond Earth, I’ve seen firsthand the potential of VLEO. Satellites in this orbit can deliver higher-resolution images, faster communication, and improved atmospheric data. For instance, sharper images from VLEO satellites can revolutionize agriculture, climate science, disaster response, and even military surveillance. Plus, reduced latency in communication means smoother phone calls and internet service. Full disclosure: I’m also a co-founder of Victoria Defense, which is exploring the commercialization of VLEO and related space technologies.
The Catch? Atmospheric Drag
So, why isn’t VLEO already packed with satellites? The answer lies in atmospheric drag. Unlike the vacuum of deep space, VLEO is still within the fringes of Earth’s atmosphere, which is thick enough to slow down satellites. Without constant propulsion, these satellites would deorbit in weeks or even days, burning up as they reenter the atmosphere. It’s like trying to ride a bike against a strong wind – you need to keep pedaling just to stay in place.
Innovations on the Horizon
But here’s the exciting part: engineers are developing innovative thruster technologies to tackle this challenge. At Penn State, my team is working on an air-breathing microwave plasma thruster, funded by the U.S. Department of Defense. This system collects atmospheric particles, heats them with microwaves, and expels them to propel the satellite forward. It’s a game-changer for VLEO, especially at lower altitudes where the atmosphere is denser. Other projects, like the Department of Defense’s partnership with Red Wire on the Otter satellite, are also pushing the boundaries of VLEO propulsion.
Other Hurdles to Overcome
Atmospheric drag isn’t the only obstacle. VLEO satellites must withstand high levels of atomic oxygen, a corrosive form of oxygen that can damage even plastics. They also face extreme temperatures due to friction with the atmosphere. But despite these challenges, the potential rewards are driving massive investment – Juniper Research estimates $220 billion will be poured into VLEO in the next three years alone.
The Future of VLEO
Imagine a world where your internet is faster, weather forecasts are more accurate, and global security is enhanced – all thanks to VLEO satellites. But here’s a thought-provoking question: as we push into this new frontier, are we prepared for the ethical and environmental implications of further crowding space? Let’s keep the conversation going in the comments – I’d love to hear your thoughts!
