Total Solar Eclipse (2017).

Total Solar Eclipse (2017).

Annular eclipse over Grand Canyon (2012).

Annular eclipse over Grand Canyon (2012).

Phases of Lunar Eclipse (2018).

Totality, Lunar eclipse (2015).

Phases of Lunar eclipse (2014).

Transit of Venus with bird (2012).

Transit of Venus (2012).

Transit of Mercury (2016).

Milky Way, Wupatki National Monument, Arizona.

Milky Way, Cathedral Rock, Arizona.

Milky Way, Arizona.

"Road to the Stars," Arizona.

Milky Way (detail).

Rho Ophiuchi

Comet PanSTARRS (C/2011 L4), Flagstaff, AZ

Comet PanSTARRS (C/2011 L4), Sedona, AZ

Comet PanSTARRS (C/2011 L4) with a large anti-tail.

Comet PanSTARRS (C/2011 L4), Flagstaff, AZ

Comet 46P/Wirtanen and Pleiades.

Comet Hale-Bopp, 1997, Colorado.

Comet Lovejoy (C/2014 Q2).

Comet Lovejoy (C/2013 R1).

Comet Lovejoy (C/2014 Q2)

Orion and M42.

Moon, Venus, and Mercury at sunset.

Star trails, Grand Canyon, Arizona.

Star trails, Cathedral Rock, Sedona, Arizona.

Star trails, Locket Meadows, Arizona.

Zodiacal Light.

Orionid meteor.

ISS and STS-133 Discovery.

ISS and STS-134 Endeavor venting prior to landing.

Discovery Channel Telescope, Arizona.

Clark Telescope, Lowell Observatory, Arizona.