Category Archives: Venus
Having made over 3,000 orbits of Venus over the past eight years, ESA’s Venus Express has (as of May 15) completed its science mission and is now in the final few months of its operational life. With a nothing-left-to-lose attitude, the spacecraft recently made a daring and risky dive down into the upper layers of the planet’s thick atmosphere, coming within 80 miles of Venus’ broiling surface on July 12 — that’s the closest any human-made spacecraft have gotten to Venus since the Soviet Vega balloon-and-lander missions of 1985!
As dangerous as it may have been for the spacecraft, Venus Express survived the encounter and grabbed some valuable data about the planet’s atmosphere along the way. It’s now working its way up to a higher altitude orbit, but there’s no escaping the fact that its fuel reserves are nearly depleted and it will soon be back on its way down into Venus’ atmosphere on a mission-ending, one-way trip.
Oh, glorious Venus! How fragrant are your sulphuric skies! How your rainbow clouds do shimmer!
Actually the sulfuric acid-laden clouds of our neighboring planet would be anything but pleasant for humans, but ESA’s Venus Express orbiter did spot some iridescent hues as it flew over. The picture above, made from images acquired on July 24, 2011, show a circular “rainbow” effect known as a glory. It’s the backscattering of sunlight observed around the shadow point of an object when the Sun is directly behind it from the perspective of the observer (in this case, Venus Express itself.)
Glories are often seen here on Earth from aircraft (but sometimes even from the ground within banks of dense fog) and the mechanics of this one on Venus are pretty much the same — except that the composition of Venus’ clouds is very different, leading to a perfect opportunity for science! Read more…
Although similar in size to Earth, the planet-next-door Venus is typically perceived as a hellish inferno of caustic clouds, crushing pressures and kiln-like temperatures. And while those are indeed all very much the case, Venus has recently been found to have a cooler side too… although it’s 125 km (77 miles) up in its atmosphere.
What a weekend for sky gazing! As promised in Friday’s article on Universe Today, Venus was visible during the daylight hours this Saturday, very close to the crescent Moon. If you had clear weather you too may have been able to catch a glimpse of the scene above, photographed from my location in north Texas at 6:35 p.m. local time.
Our neighboring planet Venus really is a world of extremes; searing surface temperatures, crushing air pressure, sulfuric acid clouds…Venus pretty much pushes the envelope on every aspect of rocky-planet existence. And now here’s one more thing that made scientists do a double-take: a shape-shifting vortex swirling around Venus’ south pole!
The presence of a cyclonic storm around Venus’ poles – both north and south – has been known since Mariner 10’s pass in 1974 and then afterwards during the Pioneer Venus mission when a downwardly-spiraling formation of clouds over the planet’s north pole was imaged in infrared. It wasn’t until ESA’s Venus Express orbiter arrived in 2006 that the cyclone at the south pole was directly observed via the Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) instrument…and it proved to be much stranger than anything previously expected. Read the rest of this entry