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Scientists discover four Earth-sized planets orbiting sun-like star
by Paul Hill
A team of international astronomers has discovered four Earth-sized planets orbiting Tau Ceti, a star similar to the Sun just 12 light years away, and visible to the naked eye if you’re residing in the southern hemisphere. The planets have masses as low as 1.7 Earth mass meaning they’re some of the smallest planets ever discovered around a Sun-like star.
Two of the four planets are in the habitable zone of the star, which simply means that they could have liquid surface water; in our own planetary system, Venus, Earth, and Mars are in the habitable zone. An important factor to mention is that the outer two planets that are in the habitable zone will likely be affected by a sizeable debris disc around the star, therefore any life that emerges or could possibly exist would have to contend with asteroids and comets slamming into the planet.
The discovery of the planets was down to advancements in the astronomers' techniques. They were detected, not directly, but rather by wobbles made to the movement of Tau Ceti. It required techniques that could detect variations in the movement of the star as small as 30 centimetres per second. Researchers are now getting close to being able to detect movements as small as 10 centimetres per second which will allow them to search for planets the same size as Earth.
Steven Vogt, professor of astronomy and astrophysics at UC Santa Cruz, said:
Sun-like stars are believed to be the best targets for finding Earth-like planets because they’re less likely to be tidally locked. Small red dwarf stars are more common, however, and any habitable planets that orbit them tend to be tidally locked due to the proximity, making them dissimilar to Earth.
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Hello java developers,
I am primarily a java developer but I've recently done some C# work and one thing that i really liked was how C# makes event driven programming so easy. So, when I came back to Java, it was a feature that i really missed. Of course, event driven programming is not impossible to do in Java, but it requires you to write addListener, removeListener, keep a list of observers etc in each class. You an also make your of Observable interface but it just does not offers the same flexibility as C# events.
I've searched for good libraries that offers similar functionality, but most of then were mainly annotation driven or hard to use or too complicated. So decided to write a framework myself. After spending some considerable amount of time researching and trying out different methods, I've finished a java library that tries to mimic C# events while keeping the code very minimal. And I though I might make the library available to anyone interested in this small project or those who have been looking for a good event driven framework.
The project is called "JEvents" (yeah,i know, a lame name) and is available here -> http://chanthus.github.io/JEvents/
Hope you find it useful. Feel free to point out any mistakes or give any suggestions.