perihelion

Earth at Aphelion 2016

Our guide to earth at aphelion for July 4th, 2016.

6 years ago

Spectacular Celestial Fireworks Commemorate Perihelion Passage of Rosetta’s Comet

Sequence of OSIRIS narrow-angle camera images from 12 August 2015, just a few hours before the comet reached perihelion. Credits:…

6 years ago

How Long Does It Take to Get to Pluto?

It's a long way out to the dwarf planet Pluto. So, just how fast could we get there? Pluto, the…

7 years ago

How Did We Find the Distance to the Sun?

How far is the Sun? It seems as if one could hardly ask a more straightforward question. Yet this very…

7 years ago

The Orbit of Earth. How Long is a Year on Earth?

Ever since the 16th century when Nicolaus Copernicus demonstrated that the Earth revolved around in the Sun, scientists have worked…

7 years ago

NASA’s STEREO Spacecraft Spots Comets ISON and Encke

As comets ISON and Encke continue toward their respective rendezvous with the Sun, they have now both been captured on…

8 years ago

This is Comet ISON Seen From Mars

It's not much to look at, but there it is: the incoming comet ISON (aka¬†C/2012 S1) as seen by the…

8 years ago

New Comet Discovered: Lovejoy Will Add to “Comet Lineup” in Winter Skies

Move over Comet ISON. You've got company. ¬†Australian amateur astronomer Terry Lovejoy, discoverer of three previous comets, including the famous,…

8 years ago

Happy (or is it Merry?) Aphelion This Friday

This 4th of July weekend brings us one more reason to celebrate. On July 5th at approximately 11:00 AM EDT/15:00…

9 years ago

See Mercury at its Greatest Elongation for 2013

A fine apparition of the planet Mercury graces the dawn skies this week, leading up to its greatest elongation from…

9 years ago