--- title: Found: A Blue Planet That Rains Glass description: Back in the early 90’s, the Voyager 2 space probe, already out beyond Neptune and on its way toward the edge of the Solar System,... canonical: https://time.com/archive/7219063/found-a-blue-planet-that-rains-glass/ author: Michael Lemonick article:opinion: false article:content_tier: free article:published_time: 2013-07-12T14:01:02.000Z article:modified_time: 2026-02-25T05:44:48.765Z article:section: Science og:title: Found: A Blue Planet That Rains Glass og:description: Back in the early 90’s, the Voyager 2 space probe, already out beyond Neptune and on its way toward the edge of the Solar System,... og:url: https://time.com/archive/7219063/found-a-blue-planet-that-rains-glass/ og:site_name: TIME og:image: https://static.time.com/v3/assets/bltea6093859af6183b/blt4a24b4939a12fec3/6998b5c2f1b082d2846ef708/par7611714.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 og:image:width: 4200 og:image:height: 2363 og:image:alt: SPACE-ARTIST-IMPRESSION-DEEP-BLUE-PLANET-HD-189733B og:type: article twitter:card: summary_large_image twitter:title: Found: A Blue Planet That Rains Glass twitter:description: Back in the early 90’s, the Voyager 2 space probe, already out beyond Neptune and on its way toward the edge of the Solar System,... twitter:image: https://static.time.com/v3/assets/bltea6093859af6183b/blt4a24b4939a12fec3/6998b5c2f1b082d2846ef708/par7611714.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 ---  * [Science](/section/science/) # Found: A Blue Planet That Rains Glass > Sponsored content. 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Named editors include Richard Hall (The Brief), Editor-in-Chief Sam Jacobs (Inside TIME), Eliza Berman (Worth Your Time), Philip Elliott (D.C. Brief), Justin Worland (Future Proof) and Harry Booth (In the Loop). Health Matters is written by TIME's health desk. #### How do I sign up for a TIME newsletter? Go to time.com/newsletters, choose the newsletters you want and enter your email address. There is no cost and no subscription requirement. ### Sources * TIME Newsletters: [time.com/newsletters](/c/time-nl-network-2026q3/newsletters?i=f5359c27-a247-4f22-b778-caa324fe90e1&cr=time-nl-network-2026q3-v1) by [Michael Lemonick](https://time.com/author/michael-d-lemonick/) Jul 12, 2013 2:01 PM UTC  A handout photo released on July 10, 2013 shows an illustration depicting HD 189733b, a huge gas giant that orbits very close to its host star HD 189733\. The planet's atmosphere is scorching with a temperature of over 1000 degrees Celsius, and it rains glass, sideways, in howling 7000 kilometre-per-hour winds. At a distance of 63 light-years from us, this turbulent alien world is one of the nearest exoplanets to Earth that can be seen crossing the face of its star. By observing this planet before, during, and after it disappeared behind its host star during orbit, astronomers were able to deduce that HD 189733b is a deep, azure blue reminiscent of Earth's colour as seen from space. AFP PHOTO / ESA / HUBBLE / NASA / M. KORNMESSER RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / ESA / HUBBLE / NASA / M. KORNMESSER" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTSM. KORNMESSER/AFP/Getty Images A handout photo released on July 10, 2013 shows an illustration depicting HD 189733b, a huge gas giant that orbits very close to its host star HD 189733\. The planet's atmosphere is scorching with a temperature of over 1000 degrees Celsius, and it rains glass, sideways, in howling 7000 kilometre-per-hour winds. At a distance of 63 light-years from us, this turbulent alien world is one of the nearest exoplanets to Earth that can be seen crossing the face of its star. By observing this planet before, during, and after it disappeared behind its host star during orbit, astronomers were able to deduce that HD 189733b is a deep, azure blue reminiscent of Earth's colour as seen from space. AFP PHOTO / ESA / HUBBLE / NASA / M. KORNMESSER RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / ESA / HUBBLE / NASA / M. KORNMESSER" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTSM. KORNMESSER/AFP/Getty Images AFP/Getty Images by [Michael Lemonick](https://time.com/author/michael-d-lemonick/) Jul 12, 2013 2:01 PM UTC Back in the early 90’s, the Voyager 2 space probe, already out beyond Neptune and on its way toward the [edge of the Solar System](http://www.time.com/time/magazine/article/0,9171,2100119,00.html), swiveled its camera around to look back at its home world. It was difficult to see, but there, nearly three billion miles (4.8 billion km) away, lay [Earth](http://topics.time.com/earth/). Our entire planet, with all its flora and fauna and history and civilizations was nothing more than a [blip of blue](http://www.time.com/time/subscriber/article/0,33009,982313,00.html) against the background of stars—an object so tiny and frail that the phrase “pale blue dot” inspired the great astronomer-communicator Carl Sagan to [write a book](http://en.wikipedia.org/wiki/Pale%5FBlue%5FDot%5F%28book%29) about humanity’s future in space. Now astronomers are abuzz with news of a second pale blue dot—a planet orbiting the star HD 189733, about 60 light-years from Earth. It’s a tiny bit less hospitable than Earth: known as HD 189733b, the planet is a giant, gaseous world resembling Jupiter, but much hotter. With a surface temperature of 1800°F (980°C), rainstorms of glass (yes, glass) and winds that reach 4,000 m.p.h. (6,400 k/h), it’s not even remotely likely to be home to flora and fauna. Measuring the color of this so-called exoplanet is a major scientific milestone nonetheless: it provides important clues to what the atmosphere is made of, which can in turn tell scientists something about the origins and composition of the planet itself. And while it’s not possible with current technology, observations like this one are a warmup for studies of true [Mirror Earths](http://science.time.com/2012/10/15/never-mind-life-on-distant-planets-what-about-distant-moons/)—smaller, more temperate worlds like ours, where life could plausibly exist. Unlike the 90’s-vintage pale blue dot, the 2013 version wasn’t photographed directly. It’s much too close to its star, and too comparatively faint, to isolate its light from that of the much brighter HD 189733\. Instead, astronomers used the [Hubble](http://topics.time.com/hubble/) [Space Telescope](http://topics.time.com/space-telescope/) to watch as the planet, whose orbit is perfectly edge-on as seen from Earth, ducked behind its star and then re-emerged. When planet and star are side by side, the Hubble picks up the light of the star itself plus the reflected starlight bouncing off the planet. When the planet moves behind the star, the reflected light disappears—and by making before-and-after comparisons, astronomers can calculate what the reflected light would look like in isolation. In this case, it’s what scientists call an “azure blue”—a little more poetic-sounding than “pale blue,” but very much in the same ballpark. On Earth, the color is produced because the blue part of the Sun’s light is scattered in all directions by air molecules—eventually reaching our eyes from so many angles that the entire sky looks blue. That blue light is reflected back into space by our oceans. On HD 189733b, the same thing evidently happens—except that it’s glassy silicate particles that do the scattering, not air, and there’s no ocean to enhance the effect through reflection. This observation is important not just because it keeps astronomers in practice for future studies, of course: it’s also crucial to understanding planets like HD 189733b—so-called “hot Jupiters,” whose very existence was completely unexpected when planet-hunters [began finding them in droves](http://www.time.com/time/subscriber/article/0,33009,984058,00.html) in the mid-1990’s. “These new observations add another piece to the puzzle over the nature and atmosphere of HD 189733b,” said Frédéric Pont of the U.K.’s University of Exeter, lead author of the study, in a press release. “We are slowly painting a more complete picture of this exotic planet.” The picture would be far more complete, of course, if, astronomers could send a Voyager-like probe to visit the HD 189733 system—and 60 light-years isn’t all _that_ far away in a Milky Way that spans 100,000 light-years. If Voyager were headed in the right direction, we could even wait for that already-flying probe to get there. 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