EarthSky Facebook friend Buddy Puckhaber of South Carolina took this photo of Stonehenge in the early morning, while visiting. He said, “My wife and I were among the first visitors of the day.” Thank you, Buddy! Used with permission.

It’s nearly summer solstice for us in the Northern Hemisphere. This solstice occurs at the instant the sun reaches its most northerly point on the celestial sphere, the imaginary sphere of stars surrounding Earth. If you stood inside the Stonehenge monument on the day of the northern summer solstice, facing north-east through the entrance towards a rough hewn stone outside the circle – known as the Heel Stone – you would see the sun rise above the Heel Stone, as illustrated in the image above. To see more photos of Stonehenge, click inside.

“110 and still going strong.” Image by Nuno Cruz.

Is there a limit to how long humans can live? The Hayflick limit and discovery of telomeres – added to census data – suggest the that maximum human lifespan may be around 120 years. However, this evidence is not entirely convincing, and some researchers believe it might be possible – via research on life extension and continued research on good health practices and the abolishment of certain diseases – to learn what would enable us humans to substantially increase our lifespans.