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Theory versus observation in astronomy
Synergistic understanding
“The standard theorist line is never believe in an observation unless it has been confirmed theoretically,” said Jack Lissauer, a space scientist in the Planetary Systems Branch at NASA’s Ames Research Center near Silicon Valley, California. “I’m trained as a theorist… but I’m interested in observations.”
Lissauer is co-discoverer of the first four planets known to orbit about faint M dwarf stars. He also co-discovered two faint outer rings and two small inner moons of the planet Uranus.
To correspond to the real universe, researchers must be constrained by observations, Lissauer said. But in order to guide observations and have some idea of where to look, as well as how best to design planet-hunting instruments, that’s where theorists come in.
“It’s synergistic,” Lissauer said. “You have to have both to be able to understand your observations theoretically and confirm your theories through observation.”
Planet migration
“Both theory and observations are key,” concurred Sean Raymond, a NASA postdoctoral researcher here at the University of Colorado’s Center for Astrobiology and Center for Astronomy and Space Astrophysics.
“Observations make discoveries, but theory is needed to interpret them,” Raymond said.
For instance, “hot Jupiters” were discovered starting in 1995, Raymond emphasized. Most of the exoplanets identified to date are these gas giants in a stable orbit very close to their parent star.
“It was certainly strange to have giant planets so close to their stars,” Raymond told SPACE.com. Theory is what probed the origin of hot Jupiters, he said, and came up with the idea of planet migration, the current model being that these planets form father out and migrate in to their current locations.
Cosmic cooking class
Consider it a lesson bubbling out of cosmic cooking class 101.
“It’s like having dinner at someone’s house. Observations can tell you the specific ingredients that went into the meal. But theory can figure out exactly how the pieces go together…how the dish was cooked,” Raymond explained.
Raymond projected outward over the next decade. He foresees the finding of Earth analogs.
“We’re going to be seeing all these little small guys. That’s going to pretty cool,” Raymond said. Furthermore, more and more of them will be found in unexpected and varied environments, and around different type stars once thought as impossible locales.
“Anytime anybody predicts, ‘ooh, this could never happen’…then you’ll find somebody to disprove it,” Raymond advised.
Light of a living planet
Margaret Turnbull, an astronomer at the Space Telescope Science Institute in Baltimore, Maryland is on a pursuit to look for life elsewhere. She has created a catalog of nearby stars — dubbed “HabCat” — that could host life forms similar to those on Earth. This catalog is now the target list for the search for extraterrestrial intelligence.
At the Space Telescope Science Institute, Turnbull is also the principle investigator of a proposed mission to deploy a small telescope on the Moon. That instrument would be designed to look back at the Earth and provide insight into how the light of a living planet changes as continents and oceans pass in and out of view, as weather patterns move, and as seasons change.
The quest for extrasolar worlds is cutting edge research and therefore is contentious, Turnbull told SPACE.com.
“It is because you are really operating at the edge of human knowledge and human understanding,” Turnbull noted. “Every new observation we make to some extent overthrows what we thought that we knew.”
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