... Trees, Stars, Aurora . ... With the Sun being unusually dormant over the past four years, the amount of Sun-induced auroras has been unusually low. ... Dust of the Orion Nebula . ... In the case of the Orion Nebula -- dust. ... As the Moon orbits the Earth, the half illuminated by the Sun first becomes increasingly visible, then decreasingly visible. ... The Helix Nebula is one of brightest and closest examples of a planetary nebula, a gas cloud created at the end of the life of a Sun-like star. ...