2. A strategist
An old joke offers an answer: Asked why, on a dark night, he was looking for his missing car keys beneath a street lamp, the man answered, "because the light's better. When searching for tye habitable exoplanets, it helps to start with worlds similar to our own.
Planets in a red dwarf's comparatively narrow habitable zone, which is very close to the star, are exposed to extreme levels of X-ray and ultraviolet UV radiation, which can be up to hundreds of thousands of times more intense than lookng Earth receives from the Sun. Yet these red-dwarfs have a potentially deadly habit, especially in their younger years: Powerful flares tend to erupt yu some frequency from their surfaces.
G-type yellow stars like our Sun, however, are shorter-lived and less common in our galaxy. What is the habitable zone?
Other similarities to Earth come into sharper focus in the search for life. But it makes sense, at least at first, to search for something more familiar. Life as we know it should be easier to find.
But most of these Earth-sized worlds have been detected orbiting red-dwarf stars; Earth-sized planets in wide orbits around Sun-like stars are much harder to detect. It also analyses reviews to lookint trustworthiness. This infographic compares the characteristics of three classes of stars in our galaxy: Sunlike stars are classified as G stars; stars less massive and cooler than our Sun are K dwarfs; and even fainter and cooler stars are the reddish M dwarfs.
If you are looking for planets with habitability, the abundance of K stars pump up your chances of finding life.
The K stars, especially the warmer ones, have the best of all worlds. They can burn steadily for tens of billions of years. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon.
The artist's conception shows a hypothetical planet with two moons orbiting in the habitable zone of a red dwarf star. Habitable zones potentially capable of hosting life-bearing planets are wider for hotter stars. Fast facts What is the habitable zone? Because our Sun has nurtured life on Earth for nearly 4 billion years, conventional wisdom would suggest that stars like it would be prime candidates in the search for other potentially habitable worlds. Stars slightly cooler and less luminous than our Sun — called orange dwarfs — are considered by some scientists as potentially better for advanced life.
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These could sterilize closely orbiting planets eere life had only begun to get a toehold. Where are we looking for life, and why? Image credit: NASA. This opens up a vast timescape for biological evolution to pursue an infinity of experiments for yielding robust life forms.
And "the light's better" in the habitable zone, or the area around a star where planetary surface temperatures could allow the pooling of water. How are ratings calculated?
And, for every star like our Sun there are three times as many orange dwarfs in the Milky Way.