Transit of Mercury, by Bryce Babcock and Kevin Reardon, Imaged at the Dunn Solar Telescope of the Sacramento Peak Observatory, National Solar Observatory / NSF – in a CH molecular line

Published October 18, 2015 at 492 × 492 in Transit of Mercury

Transit of Mercury, by Bryce Babcock and Kevin Reardon, Imaged at the Dunn Solar Telescope of the Sacramento Peak Observatory, National Solar Observatory / NSF – in a CH molecular line