National Geographic Traveler has scoured the globe for the world's most beautiful, interesting, and off-beat road trips. Dive in to get drive directions, quizzes, photos, and more.
Tuesday, November 10, 2009 |
Tuesday, November 10, 2009 |
Photo: Black Holes Belch Universe's Most Energetic ParticlesNow data from an observatory in Argentina suggest that active galactic nuclei are in fact the source of the highest-energy cosmic rays. Image courtesy NASA E/PO, Sonoma State University, Aurore Simonnet
|
ADVERTISEMENTNATIONAL GEOGRAPHIC'S PHOTO OF THE DAY |
|
ADVERTISEMENT
|