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Nemesis is a hypothetical red dwarf [1] or brown dwarf, [2] originally postulated in 1984 [3] to be orbiting the Sun at a distance of about 95,000 AU (1.5 light-years), [2] somewhat beyond the Oort cloud, to explain a perceived cycle of mass extinctions in the geological record, which seem to occur more often at intervals of 26 million years.
A twin star of the Sun may have formed along with our solar system, a new study from the Center for Astrophysics finds. If confirmed, the presence of a second star would explain mysteries of the ...
Nemesis: a star proposed as a companion to the Sun by Richard A. Muller in 1984 This star was disproved back in 2011. Coatlicue: a star thought to be the reason for how the Sun (and many other stars) came to be, proposed by Matthieu Gounelle and Georges Meynet in 2012 3 Cassiopeiae: a star recorded by astronomer John Flamsteed, but never seen ...
In physics, the twin paradox is a thought experiment in special relativity involving twins, one of whom takes a space voyage at relativistic speeds and returns home to find that the twin who remained on Earth has aged more.
Asks if the Sun has an evil twin named Nemesis, orbiting it and wreaking havoc on the planets at a 26 million-year interval. This episode explores the possibility of the existence of Nemesis and its dangerous influence on other objects in the Solar System.
Counter-Earth, a planet situated on the other side of the Sun from that of the Earth. Fifth planet (hypothetical), historical speculation about a planet between the orbits of Mars and Jupiter. Phaeton, a planet situated between the orbits of Mars and Jupiter whose destruction supposedly led to the formation of the asteroid belt. This hypothesis ...
This object, which he named Nemesis, would, once every 26 million years, pass through the Oort cloud, the shell of over a trillion icy objects believed to be the source of long-period comets that orbit at thousands of times Pluto's distance from the Sun. Nemesis's gravity would then disturb the comets' orbits and send them into the inner Solar ...
Any planetary-sized body 180 degrees from Earth should also have been visible to some space probes, such as NASA's STEREO coronagraph probes (two spacecraft launched into orbits around the Sun in 2006, one farther ahead of and one behind the Earth's orbit) which would have seen the Counter-Earth during the first half of 2007. The separation of ...