It’s coming — on September 27 there will be a total lunar eclipse, the entirety of which will be visible across much of the western hemisphere! During total lunar eclipses the Moon passes through the shadow of Earth cast by the Sun, and is colored by dusky blue, purple, and crimson light as its normally harsh glare is briefly reduced to nearly nothing before the process reverses. It’s a beautiful cosmic event to behold and this year it’s an extra special treat — not only will the Moon be totally eclipsed but it will also be at perigee, the closest point to Earth along its 27.3-day-long orbit. These days when the Moon is full at perigee it gets called a “supermoon”, and on Sept. 27 it will be totally eclipsed during the closest supermoon of the entire year. That hasn’t happened since 1982, when The Clash was Rocking the Casbah, times were fast at Ridgemont High, and virtually no one knew what an Ewok was. (Yes, kids, it’s true.)
No, no, no…a thousand times NO: Mars will not become a “second Moon” in the sky on August 27. It won’t this year, it didn’t last year, and it didn’t in the past dozen years since this silly yet strangely perennial cyber-legend (yes I just used the prefix “cyber”) first started circulating on teh interwebz. I don’t know why it keeps rising from the e-dead every year, some years more omnipresently than others, but the bottom line is it simply won’t happen. Not this time, not ever… the Solar System just doesn’t work that way. (And good thing too!)
As the midsummer Sun beats down on the southern mountains of Mars, bringing daytime temperatures soaring up to a balmy 25ºC (77ºF), some of their slopes become darkened with long, rusty stains that may be the result of water seeping out from just below the surface.
The image above, captured by the HiRISE camera aboard NASA’s Mars Reconnaissance Orbiter on Feb. 20, shows mountain peaks within the 150-km (93-mile) -wide Hale Crater. Made from data acquired in visible and near infrared wavelengths the long stains are very evident, running down steep slopes below the rocky cliffs… but the process that’s responsible for them has yet to be confirmed.
After spending a couple of years in an orbit riding high over the northern pole of Saturn Cassini has swung back down alongside the planet’s ringplane, in perfect alignment to once again capture views of the icy moons that reside there. The image above is a composite made from several narrow-angle camera images acquired by Cassini on Feb. 9, 2015, showing an extended color view of Rhea as the spacecraft was heading to perform a targeted flyby of the larger haze-covered moon Titan.
Saturn’s second-largest moon, the heavily-cratered Rhea wouldn’t appear this golden to our eyes; its natural colors are much more monochromatic (i.e., grey.) But Cassini can “see” in light stretching from ultraviolet to infrared, and that added range lets us see Rhea in a new light.
These days if you look toward the west after sunset you’ll see a bright star that’s the first to appear in the sky – except it’s not a star at all but our neighboring planet, Venus. Covered in a dense layer of thick clouds, Venus not only reflects a lot of sunlight but also keeps its surface well concealed from visible-light observations. But with the capabilities of powerful ground-based radar observatories, scientists have been able to make global maps of Venus from right here on Earth… no rockets necessary!