For 7 hours on May Mercury will transit the face of the Sun as seen from Earth. The planet is too small to be seen without a telescope (Caution! Do NOT attempt to observe the sun without appropriate eye protection).
NGC The 'Fireworks Galaxy' NGC 6946 is a medium-sized, face-on spiral galaxy about 22 million light years away from Earth. In the past century, eight supernovas have been observed to explode in the arms of this galaxy.
Volcano eruptions can wreak havoc on airline schedules, with cancellations and re-routing. The NASA/NOAA/DoD Suomi NPP satellite is delivering looks at the resulting ash clouds, which can create more accurate forecasts.