Beyond our Magnetic Bubble lies the rest of the Milky Way Within the heliosphere, the solar wind flows mostly unimpeded. The asteroids, comets and planets it encounters have little effect. Beyond the heliosphere lies interstellar space – a region that contains dust & plasma, sprinkled with other stars and their magnetic bubbles. Other planets besides Earth have magnetic fields and magnetospheres Earth isn't the only planet to have a magnetosphere. Earth's neighbor Mercury has one, and all the giant planets – Jupiter, Saturn, Neptune and Uranus – have huge magnetospheres. We do know Venus and Mars don't have planetary magnetic fields or magnetospheres – but we don’t yet know why. Auroras Everywhere Auroras have been spotted on all of the giant planets. The basic mechanism for causing auroras is the same on these planets as it is at Earth– charged particles accelerated toward the magnetic poles – but on the giant planets auroras are hundreds to thousands of times more powerful.