The Perfect Spacecraft

[triffid]

About 50-100 individual bacteria survived as spores on the moon for 2.6 years in vacuum and temperature swings.Strep. Mitis is its name.You can yahoo or google it up by typing in "moon bacteria".Just another reminder how much we will change the moon once we go back to stay.Triffid

[triffid]

There was an article written up about earth algae spores already on Mars but it was pulled or removed so who knows?Triffid

[onthecuttingedge2005]

Hi Big M.

the ability of light to push or pull may arrive from whether a Photon is emitted or absorbed by a particle.

if a Photon is Absorbed it may give rise to a pull effect where the particle is drawing up the photon from the opposite direction.

if the Photon is Emitted is gives rise to a Push effect in the photons orginal trajectory.

something to think about.

Thanks.
Jerry

[the_big_m_in_ok]

onthecuttingedge2005 (Jerry) said:

the ability of light to push or pull may arrive from whether a Photon is emitted or absorbed by a particle. ... if a Photon is Absorbed it may give rise to a pull effect where the particle is drawing up the photon from the opposite direction.

Okay.  I get that.

if the Photon is Emitted is gives rise to a Push effect in the photons orginal trajectory.

I see.  Have you thought of a laser?  Engineering scientists realize now that a laser will produce several pounds of thrust per square inch by merely emitting light from its output end.  The higher the power output the greater the thrust.
Would that not also indicate that light acts like it has mass?

--Lee 

[onthecuttingedge2005]

Hi Big M.

We know that light has radiation pressure this we can be sure of.

there used to be some Physics literature on the mass of light which was so small that by physics standards was to infinitesimal to categorize as a mass unit. so I think it was never employed as a unit of mass and hence was given as a massless particle or wave.

I can no longer find the literature on the subject so I don't even want to guess as to what unit figure was nor do I remember if the literature was peer reviewed or not.

Jerry