An Infant System.

“[T]he most breathtaking aspects of the image are the rings and gaps in the disk, never imaged before in this much detail. The largest gaps likely contain protoplanets, which form by collecting gas, dust, and small meteoroid fragments, gradually clearing their orbit of that debris. The combination of those gaps and the young age of HL Tauri suggest planets may form more quickly than astronomers think.”

Also in space news, the Atacama Large Millimeter/submillimeter Array (ALMA) captures our best look yet at potential planetary formation around a newborn star, 450 light years away. “The disk surrounding HL Tauri is much bigger than Neptune’s orbit, so any planet in the gaps would at least begin at a larger orbit than the major planets in the Solar System. Additionally, other gaps could be ‘resonances’: orbits where the combined gravity of the star and protoplanets drive matter out, concentrating it in the rings.”

Frost/Kepler.

“The planet is located about 110 million miles (177 million km) from its sun, a type K star that’s dimmer and cooler than ours…It’s located in an area crucial for the formation of planets, the so-called frost line. This is the special distance where the temperature is cold enough for ice grains to form. Any closer to the host star and these grains would be boiled off. But at or beyond the frost line, these ice grains can stick together and form planetary embryos which go on to form gas giants.”

For the first time, Kepler discovers an exoplanet near the frost line, which may help us better understand the formation of worlds. “[The frost line] explains why our gas giants are rich in ice and water, any why the rocky planets (Mercury, Venus, Earth, and Mars) began their existence as very dry worlds; water only arrived later via comets.”

Our Distant Cousin.

“‘We know of just one planet where life exists — Earth. When we search for life outside our solar system we focus on finding planets with characteristics that mimic that of Earth,’ said Elisa Quintana, research scientist at the SETI Institute…’Finding a habitable zone planet comparable to Earth in size is a major step forward.'”

New planets have been discovered at a pretty decent clip of late. But, in a milestone, NASA’s Kepler Telescope finds in Kepler 186f, 500 light years away, “the first Earth-size planet orbiting a star in the ‘habitable zone’ — the range of distance from a star where liquid water might pool on the surface of an orbiting planet.” (“Earth-size” being the key word here — Kepler has previously found larger planets in the habitable zone.) To put it all down and start again, from the top to the bottom and then…

Update: Interesting speculation: Does Kepler 186f bode ill for our future? “This apparent absence of thriving extraterrestrial civilizations suggests that at least one of the steps from humble planet to interstellar civilization is exceedingly unlikely. The absence could be caused because either intelligent life is extremely rare or intelligent life has a tendency to go extinct.”

Kepler 62, A Home Away from Home.

“‘This is the first planet that ticks both boxes,’ Dr. Charbonneau said, speaking of the outermost planet, known as Kepler 62f. ‘It’s the right size and the right temperature.’ Kepler 62f is 40 percent bigger than Earth and smack in the middle of the habitable zone, with a 267-day year. In an interview, Mr. Borucki called it the best planet Kepler has found.”

Of late, astronomers have been finding new planets all the time, including one right in our cosmic backyard. Still, these two seem special: NASA has found two of the most Earth-like planets yet in Kepler 62f and Kepler 62e, 1200 light years away.

“The Kepler 62 system resembles our own solar system, which also has two habitable planets: Earth and Mars, which once had water and would still be habitable today if it were more massive and had been able to hang onto its primordial atmosphere.”

A Home Next Door in Centauri Bb.

“The triple star system of Alpha Centauri is only 4.3 light-years — about 25 trillion miles — away. The possibility of an earth-like world orbiting our nearest neighbor has been a kind of holy grail of astronomy —- and something taken for granted by countless SciFi authors.”

Hey neighbor: Astronomers find an Earth-like planet just next door in Alpha Centauri, the nearest star system to our sun. “Indeed, Alpha Centauri Bb is the first planet with an earth-like mass ever found orbiting a sun-like star.” That being said, prospects for life — or colonization — seem, for the time being, remote. “Unfortunately for any hope of finding life on this world, it orbits only about four million miles away…This would make Alpha Centauri B more than twenty times larger in the planet’s sky than the sun is here on earth…and more than 500 times brighter and hotter.”

The Worlds Next Door.

“‘We thought we would have to search vast distances to find an Earth-like planet. Now we realize another Earth is probably in our own backyard, waiting to be spotted,’ said Harvard astronomer and lead author Courtney Dressing.”

Data from Kepler’s Space Telescope suggests that an estimated 6% of red dwarf stars have planets in the habitable zone, meaning, statistically, we are basically surrounded by inhabitable worlds. “Our Sun is surrounded by a swarm of red dwarf stars. About 75 percent of the closest stars are red dwarfs.”

A Planet Gone Ronin.

“I find this whole thing amazing. It wasn’t that long ago that the only planets we knew of orbited the Sun. The first exoplanets—planets orbiting other stars—were found in the early 1990s, and now we know of hundreds of them!…And now here’s one close by that doesn’t even have a star to call its own. It’s incredible.“

Astronomers discover rogue planet CFBDSIR2149 a mere 75 light years away — not to be confused with Melancholia, of course, which is hiding behind the sun and will soon ruin weddings and kill us all in slow motion.

Distant Mirrors, and a Devouring Hunger.

“‘This is a major milestone on the road to finding Earth’s twin,’ said Douglas Hudgins, a scientist with the Kepler program…Kepler-22b, located about 600 light years away, has a radius 2.4 times bigger than the Earth, making it the smallest planet ever found in the middle of the habitable zone around a star.” Among the several fascinating announcements in astronomy in recent weeks (including Hubble passing the 10,000th mission mark), scientists announce the discovery of a faraway habitable planet, Kepler-22b. “Scientists don’t yet know whether it is a rocky, gaseous or liquid-covered planet.” But, don’t worry — the Air Force has top men looking into the situation. Top…men.

Moreover, just today scientists announced the discovery of two Earth-sized planets — Kepler 20e and Kepler 20f. “‘For the first time, we’ve crossed the threshold of finding Earth-size worlds,’ Torres says. ‘The next step is having an Earth-size planet in the habitable zone.’” And apparently Kepler 20f may have once had water, not unlike a planet closer to home…

“This is the single most bullet-proof observation that I can think of that we’ve made this entire mission regarding the liquid water.” Something to consider if we don’t manage to tackle global warming by 2006 — the prior existence of water on Mars is further confirmed through a trail of gypsum left within an ancient rock. “Both the chemistry and the structure ‘just scream water,’ Squyres added.“

And, on a grander scale, astronomers have begun to uncover supermassive black holes (no, not those ones) at the centers of galaxies. These are “the biggest, baddest black holes yet found in the universe, abyssal yawns 10 times the size of our solar system into which billions of Suns have vanished like a guilty thought.” In other words, plenty of room for Maximillian Schell to get lost in there…Tread carefully.

Finds Along the Frontier.

“In a teleconference, Kaltenegger said that the planet is at the warm edge of its star’s habitable zone, as if ‘standing next to a bonfire.’ That means the planet would require a lot of cloud cover — which reflects starlight — to keep the surface cool enough to prevent any water from boiling, she said.“

Gliese 581g, meet HD85512b. Among the 50 new planets astronomers announced on Monday is a “Super-Earth” that lies within the inhabitable zone and could hold water. “The new super-Earth is 3.5 times the mass of Earth.“

And, how are we going to get there, you ask? While DARPA works its mojo, NASA announces its most recent plans for a successor to the Shuttle: A new Space Launch System. “Administration officials said the new rocket system…would be the most formidable launch system deployed since the Saturn V…The new rocket coupled with a deep-space crew capsule already under development should enable an un-crewed test flight of the exploration system in 2017 and a crewed test flight by 2021, officials said.” If history is any guide, you’ll probably want to tack a few years on to those dates.

While we wait, here’s another interesting cosmic find to ponder: Astronomers have found an honest-to-goodness twin-sunned Tatooine in Kepler 16b, 200 light years away. “‘This is an example of another planetary system, a completely different type that no one’s ever seen before,’ Doyle said. ‘That’s why people are making a big deal out of this.’“

The Wanderers.

“So what makes the astronomers think these are free-floating planets, and not ones orbiting stars like Earth does? Well, the lensing events themselves show only a single rise and fall of the background starlight. If the planets were orbiting stars, those stars would also act like lenses, and their effect would be seen. They weren’t.“

As explained by Discover‘s Phil Plait, a NASA-funded study using gravitational lensing finds possible evidence of billions of rogue planets wandering the cosmos between the stars. “In fact, these free-floaters may outnumber ‘regular’ planets by a factor of 1.5 or so. There are more of them than there are of us!…It’s thoughts that like which make me glad to be an astronomer, especially one living now. Just when you think the Universe is running low on surprises, it reminds us it’s a lot more clever than we are.”