... Neutrinos in the Sun . ... Readily produced in nuclear reactions and particle collisions, they can easily pass completely through planet Earth without once interacting with any other particle. Comet SOHO and Nebulae in Orion . ... Solar Flares Cause Sun Quakes . ... Earth is the only planet in the Solar System where the present surface temperature and pressure allow the three forms of water, solid (ice), liquid (ocean), and gas (water vapor condensing in clouds) to exist simultaneously. ...