Category Archives: Venus
Japan’s Akatsuki (PLANET-C) spacecraft, launched on May 20, captured this image of home as it sped away on its six-month journey to Venus. Using its ultraviolet camera Akatsuki (“Dawn” in Japanese) saw the crescent Earth as a bright electric blue from a distance of over 155,000 miles away, on May 21, 2010.
Akatsuki (as well as the IKAROS spacecraft, also launched on May 20) are doing well and on their way to Venus. Akatsuki will arrive at our planetary neighbor in December and spend two years studying its dense, turbulent atmosphere – in particular its curiously fast movement; at 220 mph it moves around Venus 60 times faster than the planet itself rotates. IKAROS, the first solar sail spacecraft, will pause briefly at Venus before heading towards the far side of the Sun.
Next year, the Japan Aerospace Exploration Agency (JAXA) will launch its Planet-C Venus Climate Orbiter, which will explore the atmosphere of Venus and investigate wind dynamics, cloud formation and other meteorological mechanics of Earth’s neighboring planet. And from now until December 25, you can register online to add your name and a short message to be included digitally aboard the orbiter!
I’m on board….click here to send your message!
Watch this to learn more about Venus and the AKATSUKI mission:
And thanks to Emily at The Planetary Society for posting about this!
It’s hard to imagine, with its pressure-cooked 800º baked-rock surface, but Venus may have once had oceans, suggests data from the European Space Agency’s Venus Express orbiter.
Extensive infrared mapping of Venus’ southern hemisphere shows large areas of rock that appears to be granite. Granite, as we know it on Earth, is formed when basalt is pushed down below the crust by tectonic actions, mixed with water and then brought back to the surface by volcanic activity. There it hardens into granite….the main building blocks of the continents.
Granite radiates heat at specific wavelengths, as do all materials, and Venus Express’ spectrometer has charted these different radiations from orbit. The data was then assembled into a comprehensive map of the southern half of the planet. The findings hint at the past life of Venus….one with volcanic activity, continental movements, and possibly even oceans like ours.
“If there is granite on Venus, there must have been an ocean and plate tectonics in the past.”
Venus is structurally very similar to Earth. Same basic size, same rocky composition, similar gravity… similar distance from the sun.But Venus is now wrapped in a much denser carbon dioxide atmosphere, holding in the sun’s heat and literally both baking and crushing the surface with heat and pressure. The existence of water there now is impossible, but it may not have always been the case. This is what the infrared map is telling us.
Venus is important to study because it is so similar to our own planet. Is Venus what Earth may one day become? Is Earth what Venus may have once been? At one time the two worlds were probably identical, yet went down very different paths. Luckily for us our planet became what it did. But it is important to investigate the alternative result too… after all, the story’s not over yet.
Image credit: ESA/MPS/DLR/IDA. Venera-13 image remapped by Don P. Mitchell.
According to a June 10 article in New Scientist, studies on the variable nature of planetary orbits have shown some valid possibilities of collisions in the future. (The very distant future, luckily for us.)
Due to the nature of Jupiter’s massive gravitational pull on the inner planets, especially Mercury, their orbits are susceptible to incredible variances over time and thousands of different scenarios have been plotted via computer models. In some of these scenarios, Earth switches places with Venus and in some of those instances the two meet face-to-face in a fatal rendezvous. In other instances, Mars is the one to call on Earth, and in yet others some of the inner planets are thrown out of the solar system entirely.
…Mars could hit Earth directly, be thrown out of the solar system, or come so close that Earth’s gravity would tear it into pieces which would rain down on our heads.
Don’t cancel your vacation plans or max out your credit cards just yet though….these catastrophic events are still just computer-generated theories, and all take place millions – even billions – of years in the future, if at all. We’ll be long gone by then, either as a species entirely or else living amongst the stars, or who knows where else.
But….that’s another hypothetical story altogether.
Original story: www.newscientist.com. Animation: J Vidal-Madjar/NASA/IMCCE-CNRS
This past Thursday, April 23, skywatchers were treated to a special event: the moon occulting (hiding) Venus. During the early morning hours (exact time depending on location) the crescent moon passed across Venus, obscuring it from Earth’s view.
This image was taken by David Cortner, a photographer in North Carolina. It shows a large-scale moon with Venus’ shining crescent, just about to be covered, in the blue-grey morning light. Click for a full resolution version.
This image was selected as NASA’s Astronomy Picture of the Day for the following Friday. Amazing shot David!
Image © David Cortner. All rights reserved. Used with permission.
This photo taken by the Messenger spacecraft in June of last year shows the ghostly pale and nearly featureless face of Venus, our sister planet. Shot in visible light and RGB-calibrated by Gordan Ugarkovic, the global shroud of Venus’ oppressive (and corrosive) atmosphere lacks the swirling detail seen in most photos of the planet, which must be imaged in ultraviolet or infrared wavelengths to discern any details in the cloud cover.
In human eyes, Venus is a bone-grey cue ball.
Although nearly the same size as Earth, and just one orbital step closer to the Sun, Venus is as utterly inhospitable to us as a planet could be. Sulphuric acid-laden clouds churn at hurricane speeds over a parched surface baking in 800º heat, crushed beneath the pressure of the dense atmosphere above. Even with a way to combat the heat, standing on the surface of Venus would be impossible for a human…the air pressure is 90 times what it is here on Earth. It would be like getting out of a submarine 3,300 feet underwater. Even the robotic surface missions sent to Venus – the Soviet Venera landers in the early 70s – only lasted a short time before succumbing to the harsh environment.
Named after the goddess of love, Venus is also protective of her secrets.
Image credit: NASA/Gordan Ugarkovic
I haven’t posted anything yet about our other neighboring planet, Venus, mostly because the currently active mission exploring it, the European Space Agency’s Venus Express orbiter, hasn’t been updating much with new images since I’ve begun this site. Still, Venus deserves some attention, so here’s a quick byte of Venus info.
Possibly the most inhospitable of planets in our solar system, the “evening star” Venus is permanently enshrouded by thick yellowish-beige clouds. In order to see any cloud structure at all, images must be made in other wavelengths of light….infrared, or ultraviolet (above). In these wavelengths invisible to our eyes, the swirling structures of Venus’ atmosphere can be made out. And what an atmosphere it is! An example of greenhouse effect to the nth degree, our neighboring Venus is a virtual oven…its scorched, rocky surface baked by 800ºF + temperatures beneath the crushing weight of its own incredibly dense atmosphere, standing “sea level” on Venus would be like being hundreds of feet underwater, just in terms of pressure per square inch. And if the heat and pressure weren’t enough, the skies are full of clouds made of corrosive sulphuric acid as well, lit by bolts of lightning and and whipped by incredible planet-wide winds clocked in the hundreds of miles per hour. All Earth-based probes that landed there (such as the Soviet Venera-13, seen below) only lasted moments on the surface before they succumbed to Venus’ destructive environment.
Venus is, quite literally, a hellish place. And, oddly enough, it is the planet that most resembles Earth, in terms of size and composition. It’s an example of how being just that much closer to the sun, without the benefit of any carbon-dioxide processing life forms like Earth has developed, drastically changes an entire planet. I may not be the most militant tree-hugger but I do realize the unmistakable effect plant life has on our world. Venus shows us what Earth could have been. Quite easily. And very well could still become. And that’s why the ESA’s Venus Express mission is so important.
More images from the Venus Express mission here.
Image credit: ESA/MPS/DLR/IDA. Venera-13 image remapped by Don P. Mitchell.