Earth-based observations announced in 2005 appeared to show that Neptune's rings are much more unstable than previously thought.

By comparison, ideal Earth-based observations have angular resolution around 0.4 arcseconds, 400 times greater.

New Earth-based observations published in 2005 appeared to show that Neptune's rings are a lot more unstable than thought before.

Earth-based observations are made difficult by Mercury's constant proximity to the Sun.

When Copernicus transformed Earth-based observations to heliocentric coordinates, he was confronted with an entirely new problem.

Select data collected from Earth-based observations are also included as part of this collection.

Hints of discoveries to come arose from Earth-based infrared observations taken in the 1970s.

Based on data from the Mariner 10 mission and Earth-based observation, Mercury's crust is believed to be 100-300 km thick.

Impact flashes from such events have been detected from multiple and simultaneous Earth-based observations.

The first three missions were dedicated to imaging 20 potential manned lunar landing sites, selected based on Earth-based observations.