Someone in the scientific community believes extraterrestrial life is "probably going to take a long time," others believe it may be more prevalent than previously thought.
system drastically different than ours. The scientists modeled on a theoretical conception of Earth in a binary system – "those with two stars – and found that they had eight percent of the time."
Multiple-star systems are common and about 50 [percent] of stars have binary companion stars. The study's co-author, Gongjie Li, said in a statement.
These types of discoveries have been made in the past, including most recently LTT 1445 A b, a distant rocky exoplanet that has three stars. LTT 1
A light-year measures distance in space and equals 6 trillion miles.
The researchers compared In the Alpha Centauri AB system, 4.4 light-years from Earth.
"Using numerical modeling in α Centauri AB, we show the following: there is a strong contrast between the planetary obliquity variations depending on the host star, planetary neighbors limit the possible spin states for Earth-like obliquity stability and the presence of a moon can destabilize the obliquity,
"We simulated what it would be like with multiple variations of the stars' masses, orbital qualities and so on," said Billy Quarles, the senior analyststudy's principal investigator, in the statement.
"Going out farther into deep space, the results become more promising, leading the researchers to believe it's a possibility."
"In general, the separation between the stars is larger in binary systems and then the second star has less of an effect on the model of Earth, "Li added. "The planet's own motion dynamics dominate other influences and obliquity usually has a smaller variation. So, this is quite optimistic. "
NASA's Exobiology Program
A comprehensive study published in June found no evidence of extraterrestrial life among more than 1,300 stars in close proximity to Earth, a hunt that spanned more than three years.
A separate study published that month drastically cut the number of planets that could potentially host intelligent life, noting that the definition for the "habitable zone" – the distance
In October, a NASA scientist published a stunning op-ed saying he found that the space agency "found evidence of life" on Mars in the 1970s. NASA has vehemently denied this claim.