Friday July 19, 2019
Home Lead Story Earth’s...

Earth’s Twin? Scientists Discover Two Planets that Could Support Life

Scientists have been searching for planets close to nearby stars since 2016 using a 3.5-meter telescope

0
//
earth twins
The Doppler technique detected at least two signals, which have now been identified as planets Teegarden b and Teegarden c. Pixabay

Two exoplanets that have been discovered, which are warm similar to Earth and may have water, could be good candidates to support life, according to a study on Tuesday. Scientists have been searching for planets close to nearby stars since 2016 using a 3.5-meter telescope.

Images captured at the Calar Alto Observatory in Almeria, southern Spain, and two other Spanish telescopes allowed researchers to analyse, in great detail, the Teegarden star — a cold red dwarf only around 12.5 light years away from our solar system, Efe news reported.

“Teegarden only has eight per cent of our sun’s mass,” said Ignasi Ribas, co-author of the study. “It is much smaller and much less brighter than the Sun. In fact, despite being very close to the Earth it was not discovered until 2003,” Ribas said.

The temperature of the star is around 2,600C (the Sun’s temperature is 5,500C) and because it is 10 times smaller, it’s 1,500 times weaker and radiates mostly infrared waves.

earth twins, life on planet
“In other words, they are much closer to their (parent) star than the Earth is to the Sun,” Ribas said. Pixabay

Once the star was found, scientists used the Doppler technique, also known as the wobble method, which uses radial-velocity measurements of the parent star to detect planets around it.

The Doppler technique detected at least two signals, which have now been identified as planets Teegarden b and Teegarden c. Teegarden b has the mass similar to Earth and orbits the star every 4.9 days. The second planet takes 11.4 days to complete the orbit, which is the length of its year. “In other words, they are much closer to their (parent) star than the Earth is to the Sun,” Ribas said.

“Teegarden, the more internal one, receives 10 per cent more light than we do from the Sun, that’s why we think it may be too hot and may not have water. But this is just speculation because there are elements of its climate that we don’t know and that could mean there could be liquid water,” he continued.

Teegarden hovers in the midst of a habitable zone, which means the temperature on its surface is between 0 degree Celcius and 100 degree Celcius, meaning it could very well have water on surface.

earth twins, life
Once the star was found, scientists used the Doppler technique, also known as the wobble method, which uses radial-velocity measurements of the parent star to detect planets around it. Wikimedia Commons

What scientists are excited about is that both exoplanets are excellent candidates to support life, alongside Proxima, which to date was the planet that presented the best conditions for habitability.

ALSO READ: NASA Selects Missions to Study Sun, its Effects on Space Weather

Experts believe between the closest star to our solar system — Proxima Centauri that is four light years away, and Teegarden (the 24th furthest away at 12 light years) — there are dozens of stars, some with planets orbiting them, but “apart from Proxima, none of them present ideal conditions (for life),” Ribas said.

Researchers have not ruled out the possibility of there being more planets orbiting Teegarden, but the system would have to be observed in more detail. “These planets are of great interest in order to search for life in the mid-term,” Ribas said. Without doubt, for the scientist, the forthcoming decade will be thrilling and key in space exploration and the search for suitable terrestrial exoplanets. (IANS)

Next Story

Oldest Evidence of Life on Earth Found in Eastern Canada, Says New Research

The recent research indicates that microbial life emerged earlier than previously known and relatively soon after the Earth's formation

0
life on earth
Microbiologist Maria Eugenia Farias from the National Scientific and Technical Research Council measuring the temperature and salinity of a hydrothermal vent in the crater of the Galan Volcano, at over 15,400 feet above sea level in Argentina. (VOA)

Canada, September 29, 2017 : Rocky outcrops in eastern Canada contain what may be some of the oldest evidence of life on Earth, dating back about 3.95 billion years.

Scientists said on September 27 that they found earliest indirect evidence of life on Earth in the form of bits of graphite contained in sedimentary rocks from northern Labrador that they believe are remnants of primordial marine microorganisms.

The researchers carried out a geological analysis of the Labrador rocks and measured concentrations and isotope compositions of the graphite, and concluded that it was produced by a living organism.

They did not find fossils of the microorganisms that may have left behind the graphite, a form of carbon, but said they may have been bacteria.

ALSO READ Discovery of 300,000-year-old Moroccan Fossils Shake Up Understanding of Human Origins

“The organisms inhabited an open ocean,” said University of Tokyo geologist Tsuyoshi Komiya, who led the study published in the journal Science.

Earth formed about 4.5 billion years ago and the oceans appeared roughly 4.4 billion years ago. The new study and some other recent research indicate that microbial life emerged earlier than previously known and relatively soon after the Earth’s formation.

Canada has produced some of the most ancient signs of life on Earth.

Another team of scientists in March reported that microfossils between 3.77 billion and 4.28 billion years old found in northern Quebec, relatively close to the Labrador site, are similar to the bacteria that thrive today around sea floor hydrothermal vents.

Other scientists last year described 3.7 billion-year-old fossilized microbial mats, called stromatolites, from Greenland. (VOA)