Because it carried a live passenger, a dog called Laika, into orbit.
Sputnik was a series of satellites built and launched by the then Soviet union. Sputnik 1 and 2 became the first two man made objects to attain orbit around the Earth.
the 2 in Sputnik 2 means it is the second to be built.
Yes, both were launched from the Baikonur Cosmodrome.
Sputnik-2
The dog, Laika, died due to temperature increase.
Sputnik?
Sputnik 2 was a solid object which was conical is shape. Solid objects do not have perimeters.
They were unmanned, although Sputnik 2 carried a dog into space.
Sputnik 2 has been in space for sixty (60) days.
me
Sputnik 1 only housed some electronics, while Sputnik 2 held a dog called Laika.
It was the first artificial object to Orbit the Earth