Our Sun may be made up of 98% hydrogen and helium but the remaining two percent comprises many other elements, detectable by their unique absorption lines within the gamut of white light we receive on Earth. One of those elements is calcium, which exists in ionized form in relatively tiny amounts in the Sun’s chromosphere – but still enough to allow images to be made using special filters aligned to the wavelength of its absorption line. And this is precisely what photographer Alan Friedman did on April 12, 2015 when he captured the image above!
On Tuesday, April 14, SpaceX launched its Dragon cargo vehicle aboard a Falcon 9 rocket from Cape Canaveral, sending over two tons of supplies up to the crew of the ISS. While the launch was a success and everything went smoothly for Dragon’s CRS-6 mission (despite a single day’s launch delay due to weather) the experimental landing of the Falcon 9’s first stage onto SpaceX’s autonomous drone ship named “Just Read the Instructions” didn’t work out so well… as you will see in the video above.
UPDATE 4/16: Here’s video footage of the landing attempt from the deck of the ship. So close!
After the landing attempt SpaceX CEO Elon Musk tweeted “Rocket landed on droneship, but too hard for survival.” Yeah, now I see what he meant. It’s actually quite surreal to watch – definitely not something you see every day!
Still, it really wasn’t that far off (it did make it onto the ship!) and with a bit more tweaking this concept of a reusable first stage should soon become a reality for the company. It was only the second live attempt, after all, and SpaceX has six more launches to go in its CRS contract with NASA. CRS-7 is slated to launch on June 19…perhaps third time’s the charm?
Watch the launch of the CRS-6 mission below.
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We’re all used to seeing fantastic images of Saturn and its family of moons from NASA’s Cassini spacecraft, which has spent the last decade in orbit around the ringed world. But every now and then Cassini aims its cameras outwards, capturing images of the sky beyond Saturn – just like we might look up at the stars from here on Earth. And while it’s not designed to be a deep-space observatory like Hubble or Subaru (or even like a modest backyard telescope, really) Cassini can still resolve many of the same stars we can easily see in the night sky… and, on April 12, 2015, it spotted something much farther away: the Sombrero Galaxy (M104), 29 million light-years distant!
Coincidentally Cassini grabbed its image of M104 exactly five years after it was imaged with Japan’s Subaru Telescope, located atop Mauna Kea.
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.
Everyone knows that Earth is a “water-world,” with oceans covering 71% of its surface and at least as much contained within our planet’s mantle deep below its crust. But there’s also liquid water to be found elsewhere in the Solar System: on Mars, on the dwarf planets Ceres and Pluto, and also on the icy moons of Jupiter, Saturn, and Neptune.
NASA is on the hunt for this water, for the main reason that it’s the key ingredient for the evolution of Earth-type life. Where liquid water exists, if there are organic molecules and energy sources as well then the stage is set for life having evolved independently of Earth. And if we can find that that’s the case somewhere, anywhere else in the Solar System, then that would be a huge – no, make that giant – step toward answering the Big Question: are we alone in the Universe?
Today NASA scientists held a conference about the search for oceans beyond Earth, and how we are currently and plan to find out where and how much is (or even was) out there. An infographic accompanied the press materials released.
“What we’re finding out is that the Solar System really is a soggy place.”
– Dr. Jim Green, NASA’s Planetary Science Director
Check out the full infographic below, along with a video of the conference.
ESA’s comet-chasing Rosetta mission is best known today for its two historic firsts of entering orbit around a comet and sending a lander onto the surface of said comet, in May and November of 2014 respectively. But Rosetta didn’t just go directly from its March 2, 2004 launch to comet 67P; it had to perform several flyby maneuvers beforehand with planets and asteroids on its way out to meet a comet. And now, ESA has shared many of the images acquired during those close passes during its cruise phase in a series of online albums for the public to easily access.
The image above shows the Moon beyond the hazy line of Earth’s atmosphere, acquired on March 4, 2005 during Rosetta’s first gravity-assist flyby of Earth just over a year after its launch. (Rosetta made three such passes by our planet before gathering enough velocity to make it out to 67P!)
See a list of Rosetta’s flybys below and find out how to access the albums.