The European built space probe Huygens Friday emitted its first signal during its final descent toward the Saturn's largest moon Titan after a seven years' interplanetary trip, announced an official of the European Space Agency (ESA).

"The baby is alive", announced David Southwood, director of Sciences of ESA from the control center of ESA in Darmstadt, Germany.

The signal emitted by the probe was captured by the radiotelescope of the National Aeronautics and Space Administration (NASA) at Green Bank in Virginia, said another ESA official, Martin Ransom.

Huygens' final descent towards Titan started at 1013 GMT and isplanned to land on the moon at around 1234GMT. During the descending process, it will film Titan's surface, measure wind speed and pressure and analyze the atmosphere as it descends to the surface.

Titan was chosen for the mission since it is the only moon in the Solar System that has a substantial atmosphere.