'Second interstellar object ever discovered in solar system'

A new object from interstellar space has been found within the solar system, only the second such discovery of its kind, according to the International Astronomical Union (IAU).

The object, given the name 2I/Borisov by the IAU, offers a tantalising glimpse beyond the solar system, and raises some puzzling questions, IAU said in a statement.

On August 30 this year, amateur astronomer Gennady Borisov from MARGO observatory, Crimea, discovered the object with a comet-like appearance.

The object has a condensed coma, and more recently a short tail has been observed, IAU said.

Borisov made this discovery with a 0.65-metre telescope he built himself, according to IAU.

After a week of observations by amateur and professional astronomers all over the world, the IAU Minor Planet Center was able to compute a preliminary orbit, which suggested this object was interstellar -- only the second such object known to have passed through the solar system.

The orbit is now sufficiently well known, and ..