...1,2,3,

Present address: Institute of Astronomy and Space Sciences of the Al Al-Bayt University, PO Box 130040, Mafraq 25113, Jordan.

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

... NED

The NASA-IPAC Extra-galactic Database (NED) which is operated by the Jet Propulsion Laboratory, Caltech under contract with the National Aeronautics and Space Administration (USA).

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.