“Twenty years ago, we didn’t know if we were the only solar system in the galaxy,” Emily Lakdawalla tells me. Lakdawalla is a geologist and senior editor of the Planetary Society and was not connected to the new study. “But now we have these thousands of exoplanetary systems.”

Many people, Lakdawalla said, want to know if exoplanetary research is locating additional Earths. But peering at other systems is useful beyond looking for extraterrestrial life: It lets us “understand how our own solar system came to be."

“By studying other exoplanetary systems, we can help decide whether our theories about our own solar system are correct or not,” Lakdawalla said.

Which the system around HD100546 may not let us do quite yet. Though it’s one of precious few examples of observed proto-planetary systems, the study’s evidence might not be useful for advocates of either competing planetary-formation theory.

“Unfortunately, from what I read in this paper, these observations don't really shed light on which of these two theories might be right,” said Amy Barr Mlinar, a planetary scientist and associate professor at Brown, in an email.

She added: “This paper does shed light on some issues such as the structure of the protoplanetary disk (how much gas is there and where the gas is) and how gas flows from the protoplanetary disk onto the growing planet. These are things that theorists can model on a computer but this may be one of the most detailed observations of this process.”

To Lakdawalla, one of the most exciting aspects of the study was evidence of a disc around the newly-discovered planet itself. That makes these new gas giants look even more like our own: Jupiter, Saturn, Neptune, and Uranus all sport a ring or ring system.

The Clemson team used two observatories, the European Southern and the Gemini, to observe HD100546, then they analyzed individual wave forms to detect the presence of certain chemicals. Specifically, they looked for carbon monoxide and hydroxide, a form of water that has had one of its hydrogen atoms blasted away by the sun.

Lakdawalla compared the actual experience of finding the planets to looking for a gap. “It’s like,” she said, “looking at Saturn’s rings and seeing a gap and wondering if there’s a moon there.”

Such a technique has been used successfully before, in fact. When Voyager 1 flew by Saturn in 1980, it photographed dark spots in the planet’s rings. Some of these gaps turned out to be moons.

More baby solar systems are likely to be found in the next few years. In the past half-decade, our understanding of exoplanets has ballooned—thanks in part to Kepler, the NASA spacecraft that has locatedalmost 1,000 planets outside our solar system. In November, a researcher at the University of California announced that Kepler data indicatedthat there could be as many as 40 billion Earth-like planets in the Milky Way galaxy alone.

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