Apollo 17·科学汇报（1973）

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 JANUARY 8, 1973
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 PLANETARY ND EARTH SCIENC-ES DIVISION
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 ll9

 HENRY gravitationally holding it together° We though it might be
 (CONT 'D)
 in the form of ionized hydrogen. We looked for Lyman-alpha

 radiation, red shifted from the ionized hydrogen, and we

 didn't see any. We set a lower limit, which certainly ex-

 cludes the possibility that the Coma cluster is held together
J
 by this ionized hydrogen. I think that may leave a real

 mystery as to what is holding the thing together.

 The fourth point may turn out to be the most interesting

 thing of all. When you look in the Milky Way, you see a

 lot of UV coming from the stars, but the question is, what

 do you see when you look up to the North Galactic Pole or

 down to the South Galactic Pole. One of the most exciting

 results of X-ray astronomy was the fact that an X-ray back-

 ground was observed over the sky that nobody had expected,

 and part of this is the gamma-ray background that Dr. Trombka

 talked about. In the UV, nobody knows, but you never know

 until you look. You do have to deal with this background

 of stars that we know is there. So we did look at a large

 number of different points at high galactic latitudes, both

. north and south. The spectrum that we see is above this

 dark count. In other words, this abnormally high dark

 current did not, in fact, interfere with that experiment.

 The spectrum that we see looks like the spectrum of the hot
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