Apollo 17 Crew Debriefing for Science, 1973

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120
HENRY
star; however, we know that there were no hot
stars within
(CONT'D)
our field of view.
Therefore, the most conservative inter-
pretation, I think, is that what we're
seeing is light from
hot stars in the galactic plane going up out of the plane
and reflecting off interstellar dust.
There are certain
characteristics of the spectrum, though, that don't fit that
theory, and it's at least possible that this is extragalactic
radiation.
I'm looking forward very much to the detailed
computer study of this, but it's going to take a long time.
Fifth point:
Lyman-alpha hydrogen radiation is a completely
separate problem, and Gary Thomas at the University of
Colorado and Charles Barthum [?] observed this from OGO-5.
We obtained Just an enormous amount of data on the Apollo
that's going to straighten out this picture and clarify it
considerably.
This is hydrogen that is inside our solar
system.
It's sunlight reflecting off this.
The hydrogen,
Gary Thomas thinks, is hydrogen from interstellar space
streaming through the solar system, and he is looking for-
ward with great anticipation to getting detailed analyses
of that.
One more thing:
the spectrum of the Earth.
I keep saying
"we
but these were the guys that were there.
We looked
?
at the Earth from outside.
A lot of people have observed
"