How to survive the intense heat of Venus by surfing its atmosphere

Space · Published 8 October 2026 Swipe more like this →

In short: To study Venus, the EnVision spacecraft must first endure a grueling two-year journey. By using a technique called aerobraking, the van-sized probe will skim the planet's thick, hostile atmosphere to lower its orbit, braving extreme solar intensity and chemical environments to reach its scientific destination.

For the ESA EnVision mission, reaching a science-ready polar orbit at 500 km altitude requires a massive descent from an initial injection altitude of approximately 250,000 km. To avoid the prohibitive propellant costs of using an Ariane 62 rocket for such a descent, engineers plan to use aerobraking. This involves thousands of passes through the upper atmosphere, dipping as low as 130 km from the surface to slow the spacecraft down. This process is essential because the spacecraft cannot afford the extra propellant required for a direct descent. This method allows the mission to transition from a high altitude to its target polar orbit efficiently.

Aerobraking around Venus is significantly more perilous than missions around Mars. Because Venus has roughly ten times the gravity of Mars, spacecraft experience velocities about twice as high as those experienced by the ExoMars Trace Gas Orbiter (TGO) during its 11-month aerobraking phase in 2017. Since heat generation increases as a cube of velocity, the EnVision mission must target a much lower aerobraking regime, resulting in a phase twice as long as TGO's. The increased gravitational pull makes the process far more difficult than previous orbital adjustments. Consequently, the mission requires a much longer duration to safely manage the descent.

The environmental challenges extend beyond friction. EnVision will operate much closer to the Sun, experiencing roughly double the solar intensity felt on Earth. While the planet's thick white clouds reflect a significant amount of sunlight back into space, the spacecraft must still be tested against these harsh conditions. This testing is vital to ensure materials can withstand the intense sunlight and the planet's chemically challenging atmosphere. The atmosphere's dense cloud layers reflect substantial solar radiation back into space. This phenomenon adds another layer of complexity that engineers must account for during the mission planning.

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