While the planets in our solar system have nearly circular orbits, astronomers have discovered several extrasolar planets
with highly elliptical or eccentric orbits.
In the last 20 years, we have learned that extrasolar planets
(planets orbiting other stars) do indeed exist, and more than 1,000 have now been cataloged.
He said that their result also demonstrates the power of this technique for measuring water and other molecules in the atmospheres of planets, giving us a new tool to study the nature and evolution of extrasolar planets
What we're doing is taking a census of extrasolar planets
, but we can't knock on every door," said Mr Petigura, a Phd student at UC Berkeley.
The much sought-after wobble shows itself as an alteration in the time between two transits, which is how long it takes for the extrasolar planet
to complete a single orbit around its star.
In 1992, astronomers used a similar method to make the first discoveries of extrasolar planets
In 1991, English astronomer Andrew Lyne and his team announced the detection of planets around a pulsar (a dead star), which seemed to be the first extrasolar planets
Therefore, oxygen had been thought to be an essential biomarker for life on extrasolar planets
The planet isn't in our solar system, so it's called an extrasolar planet
10 US Programs and Space Missions for Extrasolar Planet
A newly discovered extrasolar planet
is not only the smallest yet found, but also the first confirmed to be made entirely of rocky material, Natalie Batalha of San Jose State University in California reported January 10.
EPOXI is a combination of the names for the two extended mission components: a search for extrasolar planets
during its cruise phase to comet Hartley 2, called Extrasolar Planet
Observations and Characterization (EPOCh), and the eventual flyby of the comet, called the Deep Impact eXtended Investigation (DIXI).
Topics addressed by the papers include planetary masses and orbital parameters from radial velocity measurements, terrestrial planets in extrasolar planetary systems, mission requirements in the search for extrasolar planets
, possible detection of biomarkers indicating the presence of life on extrasolar planets
, the formation of resonant planetary systems, impact of stellar activity on the evolution of planetary atmospheres and habitability, dynamics of the extrasolar planetary, planets in double stars, the transit method of extrasolar planet
detection and analysis, US programs and space missions for extrasolar planet
research, and habitable zones in extrasolar planetary systems.
HAT-P-1b is an extrasolar planet
, which means it exists outside our solar system.
Using a network of telescopes scattered across the globe, the group says the extrasolar planet
is more Earth-like than any ever sighted.