Edit stopword list:
A different astronomy and space science related image is featured each day, along with a brief explanation.
The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.
Every day, Wired Science selects a new awesome space photo for our collection. Check out the mind-blowing views of galaxies, planets and stars.
Also contained in rocks once molten are radioactive elements whose isotopes provide Earth with an atomic clock. Within these rocks, "parent" isotopes decay at a predictable rate to form "daughter" isotopes. By determining the relative amounts of pa...