Interest in the exploration of Venus has kicked up a notch lately, especially after a contested recent discovery of phosphine, a potential biosignature, in the planet’s atmosphere. Plenty of missions to Venus have been proposed, and NASA and ESA have recently funded several. However, they are mainly orbiters, trying to peer into the planet’s interior from above. But they are challenged by having to see through dozens of kilometers of an atmosphere made up of sulfuric acid.
That same atmosphere is challenging for ground missions. While some of the recently funded missions include a component on the ground, they are missing an opportunity that isn’t afforded on many other planets in the solar system – riding along in the atmosphere. Technologists have proposed everything from simple balloons to entire floating cities – we even heard of a plan to enclose the entirety of Venus in a shell and live on the surface of that shell. But for now, balloons seem to be a more straightforward answer. That is the mission modality proposed by a team of researchers at NASA’s Jet Propulsion Laboratory to discover more about something that was only confirmed to exist on Venus in the last week – volcanism.
In a recent paper accepted to Contemporary Physics, a physicist from Imperial College London uses past missions and recent findings to encourage the importance of searching for life in the atmosphere of the solar system’s most inhospitable planet, Venus. This comes as a 2020 announcement claimed to have discovered the presence of phosphine in Venus’ atmosphere followed by follow-up observations from NASA’s recently-retired SOFIA aircraft in late 2022 that refuted it. Despite this, Dr. David Clements, who is a Reader in Astrophysics in the Department of Physics at Imperial College London, recently told Universe Today that “there is something odd going on in the atmosphere of Venus.”
Named for the ancient goddess of fertility, the planet Venus could not be more hostile to life as we know it. Aside from being the hottest planet in the Solar System, Venus has also an atmosphere that is 92 times denser than Earth’s, and regularly experiences sulfuric acid rain. But as we’ve learned from multiple surveys, Venus was once a much milder climate and even had vast oceans on its surface.
For astronomers and geologists alike, the burning question is, how much of its water did Venus hold onto during this massive transition? According to research presented by Moa Persson of the Swedish Institute of Space Physics (IRF), Venus actually retained most of its water over the past 4 billion years. Contrary to what researchers previously thought, Venus lost only a small amount of its water to a runaway Greenhouse Effect.