Life may have evolved on at least three planets in a newly discovered solar system just 39 light years from Earth, Nasa has announced.
Astronomers have detected no less than seven Earth-sized worlds orbiting a cool dwarf star known as TRAPPIST-1.
TRAPPIST-1 is an ultracool dwarf star that is approximately 8 per cent the mass of and 11 per cent the radius of our Sun.
It has a temperature of 2550K and is at least 500 million years old. In comparison, the Sun is about 4.6 billion years old and has a temperature of 5778K.
The six inner planets lie in a temperate zone where surface temperatures range from zero to 100C.
Of these, at least three are thought to be capable of having oceans, increasing the likelihood of life.
No other star system known contains such a large number of Earth-sized and probably rocky planets.
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Space Station View of the Full Moon
Credit: NASA & ISS
1959 Radio Man
After five years and 1.7 billion miles the probe accomplish a risky braking manoeuvre in order for it to be hooked by Jupiter’s gravity. NASA’s Jet Propulsion Laboratory, California received the confirmation signal which confirmed Juno had finally entered orbit on July 4. Juno will begin a two-year mission of discovery which will help scientists better understand one of the largest objects in our solar system.
Using Juno’s complex array of cameras and sensors the team hope to answer some long-awaited questions including whether Jupiter actually has a solid core or if it really is just a swirling ball of gas. Another focus will be the Great Red Spot - a massive storm several times the size of Earth that has been raging on the surface of Jupiter for what appears to be hundreds of years. Juno is the fastest spacecraft to ever enter orbit around a planet, travelling at an astonishing 130,000mph by the time it reached the gas giant.
Orion nebula & The running man nebula, by TimMorrill
Orion nebula & The running man nebula.
How the sun abducted dwarf planets from an alien solar system : porkchop_d_clown || ourspaceisbeautiful.tumblr.com
Enceladus - Life in our solar system?
Enceladus is Saturns icy moon that measures approximately 504km in diameter, about a tenth of the size of Saturn’s largest moon Titan. Almost completely covered in ice, this moon could potentially harbour the same type of life-sustaining chemical reactions found in deep sea hydrothermal vents here on Earth.
In 2005, NASA’s Saturn orbiting Cassini spacecraft spotted geysers of water and ice erupting fro fissures near Enceladus’ South Pole. Scientists believe they originate from a great ocean beneath the shell of ice. This ocean manages to stay liquid because the gravitational force exerted by Saturn is so intense that it twists and stretches the moon generating internal heat.
In October 2015, Cassini went on a dive through one of the plumes passing within just 39km of Enceladus’ surface. A team of scientists led by Hunter Waite analysed the observations made by the spacecraft. They discovered that the geysers contain between 0.4%-1.4% molecular hydrogen (H2) and 0.3%-0.8% carbon dioxide (CO2). These are being produced continuously by reactions between hot water and rock near the core of the moon. Some of the most primitive metabolic pathways found in microbes at deep ocean hydrothermal vents involve the reduction of CO2 with H2 to form methane (CH4) by a process known as methanogenesis.
Ted Chin
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