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An international team of astronomers has discovered two Earth-sized planets around a nearby star only 12.5 light-years away.
place in our solar system is to travel at the speed of light, which is 300,000 km/sec (670 million miles per hour!). Unfortunately, only radio waves and other forms of electromagnetic radiation can travel exactly this fast.
The volume of space lying within 20 light-years of Sol encompasses over 33,509 cubic light-years. Within that vast sphere, astronomers have been able to detect at least 50 Solar-masses of visible matter bound up in 138 luminous stars and weakly glowing white and brown dwarfs thus far.
The closest solitary Sun-like star to the Solar System is Tau Ceti at 11.9 light-years. It has roughly 80% of the Sun's mass but only 60% of its luminosity. The closest known free-floating planetary-mass object to the Sun is WISE 0855−0714, an object with a mass less than 10 Jupiter masses roughly 7 light-years away.
A large, carbon-based planet with a diameter roughly five times that of Earth, PSR J1719-1438 b can be found about 4,000 light-years away from our solar system. Due to immense pressure caused by the planet's gravitational pull, the carbon has been condensed, forming a gigantic diamond.
Here on Earth, we consider a year to be 365 days. Unless of course it's a Leap Year, which takes place every four years (in which it is 366). But the actual definition of a year is the time it takes our planet to complete a single orbit around the Sun.
Now, 1 light year is 63,270 AU, which means that the distance to the nearest star is 272,061 AU. We took the radius of the solar system to be 39.5 AU, which means it has a diameter of 79 AU. This means you could put the Solar System about 3440 times between the Sun and the nearest star taking this definition. If you include all the comets like we did in the second part, then the Solar System has a diameter of about 100,000 AU, which means it would fit 2.7 times between the Sun and the ...
A potentially habitable planet has been discovered just 11 light-years away. Just 11 light-years away, a sleepy red dwarf star named Ross 128 has at least one planet orbiting it. Ross-128b is roughly the size of Earth, and a little more massive. Despite a year that lasts a hair under 10 days, it may also be the nearest place to find life near Earth.
Planet Distances From the Sun. Saturn: 0.0001505453985955772 light years, or about 1.3 light hours away from the sun. Uranus: 0.0003027918751413869 light years, or about 2.7 light hours away from the sun. Neptune: 0.00047460074811487044 light years, or about 4.2 light hours away from the sun.