Astronomy Picture of the Day . Wisps of the Iris Nebula . ... All the Colors of the Sun . ... It is still not known why the Sun's light is missing some colors. ... Baringer Meteorite Crater, near Winslow, Arizona, is one of the best known impact craters on planet Earth. ... Eris: More Massive than Pluto . ... Monitoring M2-9 . ... About 2,100 light-years away and over one light-year across, M2-9 is known as a twin jet or butterfly nebula in reference to its striking bipolar symmetry. ...