Scientists have discovered and identified two new worlds that are neither planets nor stars just outside our Solar System. While a small number of similar objects have been found previously, these are the first "twins" to our knowledge.
The so-called "planemos" are independent of any star, but seem to be planet-like worlds. What makes them truly extraordinary is that they seem to circle each other. The discovery was reported in the "Science" journal.
Study co-author Ray Jayawardhana said: This is a truly remarkable pair of twins - each having only about 1% the mass of our Sun. Its mere existence is a surprise, and its origin and fate a bit of a mystery."