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Close Star Could Have up to Five Planets

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[ Science]

A new study by an international team of scientists has discovered that the star Tau Ceti may have five planets orbiting it. Tau Ceti is the 20th closest star to the sun, and the nearest star to have sun-like properties. The star has the same spectral classification as the sun, with a mass 78% that of the sun’s. It lies only about 12 light-years from Earth.

The study, published in the journal Astronomy & Astrophysics, estimates that the five planets have masses between two and six times that of Earth. This makes it the lowest-mass planetary system yet discovered. One of the planets, with a mass of about five times that of Earth, lies in the habitable zone of the Tau Ceti system, the smallest planet yet found in the habitable zone of a sun-like star.

The habitable zone of a star is defined as the area around a star where a planet could have liquid water on its surface. Just because a planet lies in the habitable zone of a system doesn’t mean it is Earth-like, however. Both Mars and Venus are within the habitable zone of our solar system, though their atmospheres don’t allow for liquid water.

“We are now glimpsing for the first time the secrets of our nearest companion stars and their previously hidden reservoirs of potentially habitable planets,” said Paul Butler, an astronomer at the Carnegie Institution for Science. “This work presages the time when we will be able to directly see these planets, and search them for water, carbon dioxide, methane, and other signposts of life.”

Astronomers used a new technique to detect the planets, applying “intensive” modeling to data collected from over 6,000 observations of Tau Ceti. The research team was able to find signals half the size of what was previously possible, increasing the sensitivity of small planet searches and discovering Tau Ceti’s satellites.

“We pioneered new data modeling techniques by adding artificial signals to the data and testing our recovery of the signals with a variety of different approaches,” said Mikko Tuomi, who led the team from the University of Hertfordshire. “This significantly improved our noise modeling techniques and increased our sensitivity to find low mass planets.”

Tau Ceti was chosen, say the astronomers, because it was though Tau Ceti had no planets and would be a good benchmark for the new technique. The researchers suggest that due to Tau Ceti’s close proximity, the atmospheres of the newly discovered planets could be analyzed in the near future.

Close Star Could Have up to Five Planets
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  • http://scogostology.wordpress.com Scogostology, SGSG

    Someday in the distant future, scientists and cosmologists will finally discover and publicly admit that there are billions of earthlike planets in our galaxies populated by beings, though not human but possess high technology and very refined and civilized cultures. Human being on earth were created through genetic gene splicing by Anunnaki Gods to help them in terra-forming earth.

    • Robert

      The earth was created by Yahweh The most high God, And Yahweh Created Adam and Eve. All these planets once had angelic life but were destroyed because of Lucifer rebellion along with 1/3 of the angles that rebelled with him against Yahweh. Anunnaki are not gods, but fallen angles. Read the Book of Enoch.

  • John Habernathy

    1 million miles is close. 12 light years is impossible. We cannot ever reach it so why are we bothering?

    • John Habernathy

      171 years travel to get there at 7% the speed of light (probably as close as we can get speed wise). That would be 6 generations of people. If you started with a crew of 4 that were 30 years old, you could have four children . They would have to be 2 male and 2 female so they could reproduce. At that point you would have a crew of 8. If it goes on 6 more times, it would be an entire crew of 64 with at least 4 dying in the first 45 years years, and every 35 years thereafter (considering the life expectancy of 75 years).
      There would be no possible way to supply a craft with supplies for that long of a period of time unless it were a small “flying world” to produce everything necessary for survival.

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