Pluto, discovered 90 years ago on Feb. 18, 1930, was long considered the solar system's ninth planet, but was relegated to dwarf planet status in 2006.

Object Details Author Schindler, Kevin Subject Lowell Observatory History Contents The Lowells talk only to Cabots -- Abandon cities and forgo plains -- The best telescope money can buy -- The mystery ...

Nestled atop Mars Hill in Flagstaff, Lowell Observatory has been a cornerstone of astronomical discovery since 1894 — and it’s still inspiring curiosity today.

An astronomer at Lowell Observatory led an international study mapping galaxy clusters, and it was published Monday in The Astrophysical Journal Letters. Michael West at Lowell led the team of ...

Pluto, discovered 90 years ago on Feb. 18, 1930, was long considered the solar system's ninth planet. Although small, it orbits the sun and has the spherical shape required to be considered a planet.