a nonexperts guide to a black holes silhouette note added april 16 some minor improvements have been made to this article as my understanding has increased specifically concerning the photonsphere which is the main region from which the radio waves are seen in the recently released image author featured author the best travel experts guest posting on the barefoot nomad we have travel experts who share their top tips on family travel destinations luxury travel and great travel tech weve been traveling around the world since 2003 first as a couple and now as a family of four avail budget flight tickets to delhi round trip usa to delhi flight bookings for todays advance flight prices click on view deals air india flight booking status air india flight is the national airline of india headquartered in new delhi it was founded by jrd tata as tata airlines in 1932