[ExI] Life must be everywhere!

[BillK]

2012/4/14 Tomaz Kristan wrote:
> The velocity of the Pioneer probes was several tens of km per second.
>
> The escape velocity from the distance of Earth's orbit out of the Solar
> system is about 17 km/s.
>
> Virtually everybody should know that. Especially people discussing here.
>
>

:)  Escape velocity depends on what you are escaping from.

in the Solar System, to escape from the Milky Way's gravity:   	≥ 525 km/s

Pioneer was 'just' escaping from the solar system.

To leave planet Earth, an escape velocity of 11.2 km/s (approx. 40,320
km/h, or 25,000 mph) is required; however, a speed of 42.1 km/s is
required to escape the Sun's gravity (and exit the Solar System) from
the same position.


BillK