This is our best look yet at asteroid 2014 JO25, which made its closest pass by Earth for at least the next 500 years on April 19, 2017. The animation above is composed of radar observations made from NASA’s Goldstone facility in California when the asteroid was between 1.53 and 1.61 million miles away. These and earlier, lower-resolution images obtained the previous day (you can see those here) showed this asteroid to be a contact binary—two objects connected by a “neck” of material, not unlike the comet 67P that ESA’s Rosetta mission explored. The largest section of JO25 is estimated to be 2,000 feet (610 meters) wide, and at its widest the entire asteroid is about 3,300 feet (1 km) across. Observations also show JO25 rotates once every 4.5 hours.
It may be in its 14th year on Mars but Opportunity still has some surprises to show us—like this, a series of images captured on May 3, 2017 showing the Sun as seen from Mars. But that’s not the special part: see the change in brightness along the Sun’s edge near the end? That was a brief transit of Phobos, the largest (and nearest) of Mars’ two moons!
Can’t see it very well? It’s quick, I know—so check out a cropped and enlarged version below:
Cassini did it again! On May 2-3, 2017 the spacecraft made its second “ring dive” pass of Saturn, passing through the clear space between the innermost edge of the ring system and the planet itself. The animation above shows a view from Cassini looking back toward Saturn on its outbound flight on May 3, just a few hours after the ringplane crossing. Saturn’s limb is visible at upper left.
What’s more, NASA has released a detailed video from the first ring dive on April 26, showing all of the images that were captured and where on Saturn Cassini’s cameras were pointed. Check it out below.
Like people, stars are found in all colors and sizes. They can range from small, sassy red dwarfs to giant blue beasts. In fact there are seven main types of stars, grouped by their apparent colors (and thus temperatures) and classified as O, B, A, F, G, K, or M in order of hottest to coolest. (Learn more about that here.) The video above, released by The Royal Observatory in Greenwich, England, gives a brief life history of three of the most common types of stars found in our galaxy: blue O stars, red M dwarfs, and yellow G stars—the latter of which being the class of our own Sun. It’s really fun, cute, and educational—check it out, and also find more videos on The Royal Observatory’s Vimeo page.
Mars may have an atmosphere just 1% the density of Earth’s but it can still stir up enough of a breeze to quickly cover a rover’s tracks, as evidenced in the animation above. Captured by Curiosity’s downward-looking Mars Descent Imager (MARDI) camera on Jan. 23 and 24, 2017, the two pictures show an approximately 3-foot-wide area just beneath the rover (part of one wheel is visible at upper left.) In the first image Curiosity’s wheel tracks are fresh and crisp; in the second, they’ve been blurred by wind shifting the fine Martian sand. As summertime is the windiest season within Gale Crater, one could easily imagine the rover’s tracks being completely obliterated after a week or so!
Source: NASA’s Planetary Photojournal