Mission Architecture to Characterize Habitability of Venus Cloud Layers via an Aerial Platform

TL;DR

This paper proposes a Venus cloud exploration mission using a balloon aerobot to assess habitability and search for signs of life, aiming to operate for up to 30 days in the planet's cloud layers.

Contribution

It introduces a novel aerial platform concept for Venus cloud exploration, including mission design, instrumentation, and operational strategies, to evaluate habitability and detect potential life signs.

Findings

Design of a super-pressure balloon aerobot for Venus clouds

Mission concept for 2026 launch targeting habitability assessment

Potential to complement other Venus exploration missions

Abstract

Venus is known for its extreme surface temperature and its sulfuric acid clouds. But the cloud layers on Venus have similar temperature and pressure conditions to those on the surface of Earth and are conjectured to be a possible habitat for microscopic life forms. We propose a mission concept to explore the clouds of Venus for up to 30 days to evaluate habitability and search for signs of life. The baseline mission targets a 2026 launch opportunity. A super-pressure variable float altitude balloon aerobot cycles between the altitudes of 48 and 60 km, i.e., primarily traversing the lower, middle, and part of the upper cloud layers. The instrument suite is carried by a gondola design derived from the Pioneer Venus Large Probe pressure vessel. The aerobot transmits data via an orbiter relay combined with a direct-to-Earth link. The orbiter is captured into a 6-h retrograde orbit with a low, roughly 170-degree, inclination. The total mass of the orbiter and entry probe is estimated to be 640 kg. An alternate concept for a constant float altitude balloon is also discussed as a lower complexity option compared to the variable float altitude version. The proposed mission would complement other planned missions and could help elucidate the limits of habitability and the role of unknown chemistry or possibly life itself in the Venus atmosphere.