Category Archives: Saturn’s Moons

Saturn and Titan Show Off Their Crescents

Cassini image of Saturn and Titan from Aug. 11, 2013 (NASA/JPL-Caltech/SSI)

Cassini image of Saturn and Titan from Aug. 11, 2013 (NASA/JPL-Caltech/SSI)

It may not be in color but that doesn’t make it any less beautiful: this stunning image from Cassini shows Saturn and its largest moon Titan – the second-largest moon in our solar system, after Jupiter’s Ganymede – from their night sides, both showing their crescents against the blackness of space.

Titan’s crescent nearly wraps all the way around its globe, because of the way its thick atmosphere scatters sunlight.

The view was obtained at a distance of approximately 1.1 million miles (1.7 million kilometers) from about 3 degrees above the ringplane. The image was taken in violet wavelengths with Cassini’s wide-angle camera (WAC) on Aug. 11, 2013.

Source: NASA/JPL

Cassini Spots the Sun Shining on Titan’s Sea

Infrared mosaic image showing sunglint off Titan's Kraken Mare. (NASA/JPL-Caltech/University of Arizona/University of Idaho)

Infrared mosaic image showing sunglint off Titan’s Kraken Mare. (NASA/JPL-Caltech/University of Arizona/University of Idaho)

There’s nothing like the beautiful reflection of sunlight off the mirrored surface of a lovely lake… regardless if you’re on Earth or Saturn’s moon Titan! This picture, a mosaic of images acquired by Cassini’s Visual Infrared and Mapping Spectrometer (VIMS) instrument during a flyby on August 21, 2014, shows exactly that: sunglint reflecting off the super-smooth surface of the moon’s largest polar lakes.

(Except unlike on Earth this lake isn’t filled with liquid water but rather liquid methane and ethane!)

Read the rest of this entry

Cassini Watches Clouds Form Over Titan’s Methane Sea

Animation of clouds forming over Ligeia Mare, one of Titan's many large methane lakes (NASA/JPL-Caltech/SSI)

Animation of clouds forming over Ligeia Mare, one of Titan’s many large methane lakes (NASA/JPL-Caltech/SSI)

What’s the weather forecast on Titan? Well if you’re planning a vacation down by the shores of Ligeia Mare you may get some cloudy skies, if what happened at the end of July repeats itself!

The animation above was made from images acquired by Cassini during a flyby of Titan in July 2014, showing the formation and dissipation of bright methane clouds over one of the moon’s polar lakes. Spanning a period of two days, the images reveal what may be the start of summer weather in Titan’s northern hemisphere… or just a bit of isolated “lake effect” cloudiness.

Read the rest of this entry

Cassini Marks Ten Discovery-Filled Years at Saturn

Cassini by the Numbers: an infographic of the spacecraft's achievements over the past decade (NASA/JPL-Caltech)

Cassini by the Numbers: an infographic of the spacecraft’s achievements over the past decade (NASA/JPL-Caltech)

Just a week after Curiosity celebrated its first Martian year in Gale Crater and we have yet another milestone anniversary in Solar System exploration: as of 10:48 p.m. EDT tonight Cassini will have been in orbit around Saturn for a full decade!

“There are times when human language is inadequate, when emotions choke the mind, when the magnitude of events cannot properly be conveyed by the same syllables we use to navigate everyday life. The evening of June 30, 2004 was such a time.” 

– Carolyn Porco, Cassini Imaging Team Leader, CICLOPS “Captain’s Log” on June 30, 2014

That’s ten years and over 2 billion miles of discoveries and explorations of our Solar System’s most majestic planet and its incredibly varied family of moons. Over the course of its primary mission and three extended missions, we have been able to get a close-up look at Saturn and its moons like never before, witnessing first-hand the changes that occur as their seasons change. What’s been discovered by the Cassini mission about Saturn has offered invaluable insight into the evolution of our entire Solar System, as well as planets that could be found elsewhere in our galaxy.

“Having a healthy, long-lived spacecraft at Saturn has afforded us a precious opportunity,” said Linda Spilker, Cassini project scientist at NASA’s Jet Propulsion Laboratory in Pasadena, California. “By having a decade there with Cassini, we have been privileged to witness never-before-seen events that are changing our understanding of how planetary systems form and what conditions might lead to habitats for life.”

Launched on October 15, 1997, the Cassini-Huygens spacecraft established orbit around Saturn on June 30, 2004 (July 1, UTC).

Read the rest of this entry

What’s Ahead for Cassini?


If you’ve been a faithful reader of Lights in the Dark over the past five years you know that I just love Cassini (and you probably do too!) In orbit around Saturn since 2004, Cassini has taken us on an intimate tour of the Saturnian system for a decade now, revealing the incredible beauty of the ringed planet and its family of moons like no spacecraft ever has before. Thanks to Cassini and the Huygens probe, we have seen the surface of Titan for the first time, witnessed the jets of Enceladus, discovered many previously-unknown moons (and moonlets) and basically learned more about Saturn over the past ten years than since Galileo first pointed his telescope at it.

Cassini's final maneuver will be to dive through a gap in Saturn's rings in 2017 (NASA/JPL-Caltech)

Cassini’s will dive through a gap in Saturn’s rings in 2017 and sample the planet’s upper atmosphere (NASA/JPL-Caltech)

Although nearing the end of its life span, Cassini still has a few good years left and scientists are taking full advantage of its remaining time around Saturn to learn as much as they can before the spacecraft makes its final dive into the planet’s atmosphere in 2017.* The video above shows what awaits Cassini in the years ahead — some of its best discoveries may be yet to come. Check it out!

Learn more about the Cassini mission and read about its latest discoveries here and here.

*The exact plan for the end of Cassini’s mission has not yet been finalized.

Saturn’s Still in the Business of Making Moons

A 750-mile (1,200-km) -long feature spotted on Saturn’s A ring by Cassini on April 15, 2013 could be a new moon in the making (NASA/JPL-Caltech/SSI)

This 750-mile (1,200-km) -long feature spotted on Saturn’s A ring on April 15, 2013 could be a new moon in the making (NASA/JPL-Caltech/SSI)

Congratulations! It’s a baby… moon? A bright clump spotted orbiting Saturn at the outermost edge of its A ring may be a brand new moon in the process of being born, according to research recently published in the journal Icarus.

“We have not seen anything like this before,” said Carl Murray of Queen Mary University in London, lead author of the paper. “We may be looking at the act of birth, where this object is just leaving the rings and heading off to be a moon in its own right.”

Read the rest of this article here.

Just Another Hazy Day on Titan

Color-composite of Titan made from raw images acquired by Cassini on April 7, 2014. (NASA/JPL-Caltech/SSI/J. Major)

Color-composite of Titan made from raw images acquired by Cassini on April 7, 2014. (NASA/JPL-Caltech/SSI/J. Major)

The weather forecast for Titan? Cloudy, hazy, and cold — just like every other day! The image here is a color-composite made from raw data captured by Cassini during a flyby on April 7, 2014, and it shows a look at the two main features of Titan’s atmosphere: a thick orange “smog” made of organic compounds created by the breakdown of nitrogen and methane by UV light, and a wispy blue upper-level haze composed of complex hydrocarbons.

Cassini was approximately 19,076 miles (30,700 km) from Titan when these particular images were captured.

Read the rest of this entry

Follow

Get every new post delivered to your Inbox.

Join 16,036 other followers

%d bloggers like this: