Here’s an interesting tidbit that came across my radar today: A very illusive and rare meteor shower may flare up tonight for the first time since 1930! On June 11th of that year, a small group of astronomers reported a short-lived meteor shower that was sought out in subsequent years, but never seen again. Now an astronomer named Peter Jenniskens with NASA and SETI has suggested that Earth is passing through the same comet trail it did back in 1930, and thus we could see this rare outburst, called the Gamma Delphinids, again- TONIGHT. Fortunately the moon will have set several hours before the expected peak between 2:30 and 4:30am CDT, leaving only the weather to stand in the way of getting to witness this rare event. I must point out, however, that scientists aren’t nearly as certain about this meteor shower as they are about the more reliable yearly showers such as the Leonids, Geminids, Perseids, etc… So if you’re a fan of meteor showers and have the will power to get up in the wee hours and sit outside to watch, tonight could reward your efforts with a show not seen in 83 years. (Via Universe Today and the American Meteor Society)
In other science news, more evidence of normal, habitable water on the ancient Mars surface was discovered recently. You’re probably thinking this discovery came from the Curiosity rover, but it actually came from Opportunity, one of the twin rovers that landed on Mars in 2004. Opportunity’s team sent her to investigate an interesting rock outcropping, and they found evidence of certain clay minerals that could only have formed in water that would be habitable to life as we know it. This discovery is right in line with Curiosity’s findings from February, and strongly supports the theory that Mars once had running water on the surface, and might have even supported microbial life! As Curiosity keeps trekking toward Mount Sharp, the rover will keep looking for these same minerals to help paint a clearer picture of Mars’ watery past. (Via New Scientist)
February 14, 2013
It’s been a hot minute since I mentioned the Mars rover Curiosity. She’s been slowly but surely working her way across Gale Crater, stopping to take photos along the way and investigate anything interesting she comes across. Recently she came across this bizarre-looking rock protrusion that looks a bit like a shiny door handle or knob:
It was a pretty interesting and puzzling find, but NASA scientists think they have an explanation. Indeed, it’s not a knob or hood ornament, nor is it made by aliens. A much more logical explanation is uneven weathering and erosion. For the full details head over to Universe Today. But in short, Ronald Sletten from the Mars Science Laboratory team at NASA/JPL explained in a press release that the object is a small part of the rock that is different in composition from the rest. The shiny part is made up of a harder type of rock than its surroundings. Since the surface of Mars is home to lots of dust/wind storms, there is quite a bit of wind erosion, and the softer surrounding rock erodes aways much faster than the harder rock. The shininess is also a by-product of erosion- certain types of rocks have a tendency to become smooth and shiny from erosion rather that just being blown away. NASA also posted a PDF with some good photos comparing the Mars image to similar phenomena on Earth. What I’m wondering is- what is that harder part of the rock made of? Why is there? Are there any other formations like it nearby? I know that on earth some volcanic rocks have a smooth & shiny appearance, so could this be a chunk of volcanic rock that was flung from an eruption and landed in water, then moved to its current location by fast-moving water and deposited in a muddy area that subsequently hardened into sedimentary rock? Maybe more theories will come out soon.
In other Curiosity news, the final instrument yet to be used/tested was the percussive rock drill. The drill was successfully tested and then used on Feb. 8th to drill the hole seen on the left in this image:
The rover has now successfully tested all of her science instruments and everything is working perfectly. A sample of the pulverized rock was taken, and will be analyzed in the days to come. This rock is suspected of having been altered or eroded by flowing water on the surface many millions of years ago. I’m looking forward to seeing what they find to confirm (or deny) this theory and what else is learned about Mars’ watery past.