First visible light images of Venus' surface from space captured by Parker Solar Probe
by Staff Writers
Washington DC (SPX) Feb 10, 2022
On a flyby of Venus, NASA's Parker Solar Probe captured the first visible light images of the cloudy planet's surface from space, a new study reports. The nightside view of the extremely hot surface could help scientists understand the contrasting evolution of Earth's nearest neighbor.
Smothered in thick clouds, Venus' surface is usually shrouded from sight. But in two recent flybys of the planet, Parker used its Wide-Field Imager, or WISPR, to image the entirety of the nightside in wavelengths of the visible spectrum - the type of light that the human eye can see - and extending into the near-infrared.
The images, combined into a video, reveal a faint glow from the surface that shows distinctive features like continental regions, plains, and plateaus. A luminescent halo of oxygen in the atmosphere can also be seen surrounding the planet, according to the new study in AGU's journal Geophysical Research Letters, which publishes high-impact, short-format reports with immediate implications spanning all Earth and space sciences.
Such images of the planet, often called Earth's twin, can help scientists learn more about Venus' surface geology, what minerals might be present there, and the planet's evolution. Given the similarities between the planets, this information can help scientists on the quest to understand why Venus became inhospitable and Earth became an oasis.
"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," said Brian Wood, lead author on the new study and physicist at the Naval Research Laboratory in Washington, DC. "Now, we finally are seeing the surface in visible wavelengths for the first time from space."
Glowing Like An Iron From The Forge
As it passed by Venus, WISPR picked up a range of wavelengths from 470 nanometers to 800 nanometers. Some of that light is the near-infrared - wavelengths that we cannot see, but sense as heat - and some is in the visible range, between 380 nanometers and about 750 nanometers.
Venus In A New Light
The WISPR images show features on the Venusian surface, such as the continental region Aphrodite Terra, the Tellus Regio plateau, and the Aino Planitia plains. Since higher altitude regions are about 85 degrees Fahrenheit cooler than lower areas, they show up as dark patches amidst the brighter lowlands. These features can also be seen in previous radar images, such as those taken by Magellan.
Beyond looking at surface features, the new WISPR images will help scientists better understand the geology and mineral make-up of Venus. When heated, materials glow at unique wavelengths. By combining the new images with previous ones, scientists now have a wider range of wavelengths to study, which can help identify what minerals are on the surface of the planet. Such techniques have previously been used to study the surface of the Moon. Future missions will continue to expand this range of wavelengths, which will contribute to our understanding of habitable planets.
This information could also help scientists understand the planet's evolution. While Venus, Earth, and Mars all formed around the same time, they are very different today. The atmosphere on Mars is a fraction of Earth's while Venus has a much thicker atmosphere. Scientists suspect volcanism played a role in creating the dense Venusian atmosphere, but more data are needed to know how. The new WISPR images might provide clues about how volcanos may have affected the planet's atmosphere.
In addition to the surface glow, the new images show a bright ring around the edge of the planet caused by oxygen atoms emitting light in the atmosphere. Called airglow, this type of light is also present in Earth's atmosphere, where it's visible from space and sometimes from the ground at night.
"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. "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."
The first WISPR images of Venus were taken in July 2020 as Parker embarked on its third flyby, which the spacecraft uses to bend its orbit closer to the Sun. WISPR was designed to see faint features in the solar atmosphere and wind, and some scientists thought they might be able to use WISPR to image the cloud tops veiling Venus as Parker passed the planet.
"The objective was to measure the speed of the clouds," said WISPR project scientist Angelos Vourlidas, co-author on the new paper and researcher at Johns Hopkins University Applied Physics Laboratory.
But instead of just seeing clouds, WISPR also saw through to the surface of the planet. The images were so striking that the scientists turned on the cameras again during the fourth pass in February 2021. During the 2021 flyby, the spacecraft's orbit lined up perfectly for WISPR to image Venus' nightside in entirety.
"The images and video just blew me away," Wood said.
Research Report: "Parker Solar Probe Imaging of the Night Side of Venus"
Persistence, encouragement, innovation keeps NASA's DAVINCI on track
Greenbelt MD (SPX) Feb 04, 2022
The concept of a NASA-led Venus deep atmosphere chemistry probe was developed and evolved over more than a decade. Through multiple mission bids starting in 2008, rejections and tailored re-designs, a team of scientists and engineers finally prevailed with the selection of the Deep Atmosphere Venus Investigation of Noble gases, Chemistry, and Imaging, or DAVINCI mission in June 2021. Among this team of dedicated scientists and engineers, Michael Amato at NASA's Goddard Space Flight Center in Green ... read more
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