More NASA, ESA, Caltech / ISTOCK / GETTY IMAGES PLUS "[T]he puzzle for theoretical astrophysics ... of a large object passing through the solar system to determine if such a cosmic visitor may ...

The exoplanet GJ 1214 b was a puzzle for more than a decade because its dense ... That is why it is a “sub-Neptune”, a class of exoplanet that does not occur in our Solar System. To reveal its secrets ...

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit before shoving four of the solar system's planets onto a different course.

The solar wind, a torrent of charged particles, streams through the solar system ... piece of this cosmic puzzle. A team of researchers used data from NASA’s Parker Solar Probe and the European ...