The James Webb Space Telescope’s magnificent first photos, which scientists will dissect for years to come, have been feted this week in a parade of reveals from NASA.

After a flurry of deep space images were unveiled Tuesday—showing technicolor clouds of cosmic nebulae, and a sky speckled with galaxy clusters over 13 billion light-years away—another set of images was released Thursday, showing a more familiar but no less illuminating view of Jupiter, a planet within our humble solar system.

Captured as an early test of the telescope’s instruments, before roving further into the universe, the data offers stunning detail of the gas giant, including its rings and several of its moons, Europa, Thebe, and Metis.

One the left, Jupiter, center, and its moons Europa, Thebe, and Metis are seen through the James Webb Space Telescope’s NIRCam instrument 2.12 micron filter. On the right, Jupiter and Europa, Thebe, and Metis are seen through NIRCam’s 3.23 micron filter. [Images: NASA, ESA, CSA, and B. Holler and J. Stansberry (STScI)]

Webb’s ability to see Jupiter’s hazy rings is especially rare. The rings are formed when meteors collide with Jupiter’s moons, kicking up dust particles that are just light enough to escape the moon’s gravity and be pulled into orbit around the planet. They exist so tenuously that they eluded detection for decades, until 1979’s Voyager 1 expedition journeyed to the dark side of Jupiter and looked backward, discovering a thin silhouette of rings against the sun.

Jupiter and some of its moons are seen through NIRCam’s 3.23 micron filter. [Image: NASA, ESA, CSA, and B. Holler and J. Stansberry (STScI)]

Webb’s images also show Jupiter’s signature bands, formed by alternating zones of atmospheric gas, as well as its famous Great Red Spot, where a storm big enough to engulf our Earth rages on its surface.

“Combined with the deep field images released the other day, these images of Jupiter demonstrate the full grasp of what Webb can observe, from the faintest, most distant observable galaxies to planets in our own cosmic backyard that you can see with the naked eye from your actual backyard,” Bryan Holler, a scientist at Baltimore’s Space Telescope Science Institute who helped to map out the observations, said in a statement.

For astronomers, the data was proof that Webb can detect faint objects like satellites or rings even when they are near very bright celestial bodies like Jupiter, Saturn, or Mars. (In some images, Europa’s shadow is visible near Jupiter’s red spot.)

In the future, they hope to use Webb to observe plumes of water spewing forth from Europa’s underground ocean, through its icy crust, and into space—as well as similar phenomena occurring on Saturn’s moon, Enceladus. Such study could yield insight on the composition of these oceans, which some believe could harbor alien life.

Beyond that, the test results also shed light on Webb’s ability to track objects hurtling through space at high velocities. Jupiter, which orbits the sun at roughly 29,000 miles per hour, registers at a speed of 3.3 milliarcseconds per second from where the Webb telescope is stationed (milliarcseconds are a measure of degrees traveled in orbit). However, the telescope’s tracking of an asteroid flying between Mars and Jupiter demonstrated that Webb could follow objects moving up to 67 milliarcseconds per second—more than twice the maximum for which it was engineered.

Asteroid 6481 Tenzing, center, is seen moving against a background of stars in this series of images taken by NIRCam. Click on the image to play the gif again. [Images: NASA, ESA, CSA, and B. Holler and J. Stansberry (STScI)]

But to throw the universe into perspective: However fast these objects are moving in absolute time, the sheer vastness of space still dwarfs. As NASA puts it, Webb photographing a 67 milliarcsecond-per-second target would be like you photographing a turtle crawling, a mile away from where you’re standing.


Source link

Leave a Reply

Your email address will not be published. Required fields are marked *