As Parker approached Venus in February 2021, it was able to capture the red thermal glow exuded by Venus created by heat coming from the planet’s surface.
“The surface of Venus, even on the nightside, is about 860 degrees,” said lead study author Brian Wood, a physicist at the Naval Research Laboratory, in a statement. “It’s so hot that the rocky surface of Venus is visibly glowing, like a piece of iron pulled from a forge.”
The surface of Venus remains very much a mystery to scientists because it’s hidden beneath thick clouds that prevent it from being seen.
The Parker Solar Probe has an imager, called WISPR, that was able to peer beneath this hazy cover while imaging the entire nightside of Venus in visible light that humans can see, as well as near-infrared light, which is otherwise invisible to us. The name WISPR is short for Wide-field Imager for Parker Solar PRobe.
The images show that the Venusian surface exudes a faint glow, and features like plains, plateaus and continental regions can be distinguished. There is also a glowing halo of oxygen in the planet’s atmosphere called airglow, a type of light that also exists in Earth’s atmosphere.
“We’re thrilled with the science insights Parker Solar Probe has provided thus far,” said Nicola Fox, division director for the Heliophysics Division at NASA Headquarters, in a statement. “Parker continues to outperform our expectations, and we are excited that these novel observations taken during our gravity assist maneuver can help advance Venus research in unexpected ways.”
“Venus is the third brightest thing in the sky, but until recently we have not had much information on what the surface looked like because our view of it is blocked by a thick atmosphere,” Wood said. “Now, we finally are seeing the surface in visible wavelengths for the first time from space.”
Previous missions to Venus have shared insights about the planet using radar and infrared-detecting instruments that could penetrate the thick clouds, like NASA’s Magellan mission in the early 1990s.
The new images can help scientists learn more about the geology and minerals present on Venus because they glow in unique wavelengths of light when heated.
Parker will continue to use gravity assists from Venus as it spirals closer to the sun, but the trajectory of the next flyby won’t allow for imaging. The next opportunity to image Venus will be during the seventh and final flyby in November 2024.
“By studying the surface and atmosphere of Venus, we hope the upcoming missions will help scientists understand the evolution of Venus and what was responsible for making Venus inhospitable today,” said Lori Glaze, director of the Planetary Science Division at NASA Headquarters, in a statement.
“While both DAVINCI and VERITAS will use primarily near-infrared imaging, Parker’s results have shown the value of imaging a wide range of wavelengths.”