Sputnik-1 was the first man made spacecraft, which was launched on October 4, 1957 by:

Sputnic-1 was artificial satellite/
The diameter of Sputnic-1 was 58 cm.
It has an antenna of 2.4-2.9 meters long.
It was a Basket Ball size manmade satellite.
It sent a radio signal back to earth after 3 weeks before zinc batteries ran out.