The Inner Solar System is depleted in both Hydrogen*, and Carbon**. The chemical combination of Hydrogen & Carbon, Methane (CH₄), was a principal component of Earth's Primordial Volcanic Degassings (~4.5 to 4.4 Ga)***. And, in the Proto-Solar Nebula, Methane Ices only froze-formed beyond about 30 AU#. So, surely, Methane only existed as a Gas, in the Inner Solar System.

*

W.T. Sullivan III & J.A. Baross.

Planets and Life

, pg. 88.

See also

:

Attachment 1

**

ibid

., pg. 463.

See also

:

Attachment 2

***

ibid

., pg. 101.

#

Carroll & Ostlie.

Introduction to Modern Astrophysics

(

1996 ed

.), pg. 893.

 

 

CONCLUSION (?):

 

During the Sun's T-Tauri Phase, for roughly the first 10 million years of its existence, "the gas & dust of the Proto-Planetary Disk were expelled... all that remained were the Protoplanets, or the largest Embryonic Planets"*. Perhaps the young Sun's vigorous Solar Wind expelled copious quantities of Methane Gas, from the Inner Solar System, simultaneously explaining the depletions of Hydrogen & Carbon from that region.

*

F.Casoli & T.Encrenaz.

The New Worlds

, pg. 72.

Before the Sun's solar wind blew the dust away, Earth was already in a rocky formation and was forming an atmosphere. There is no contradiction between Earth having methane and the Sun expelling it from the solar system in outer space.

Figure 3.11 is good data. But there is no asteroid hydrogen/deuterium ratio data. Recently there is a paper about asteroid belt water near the orbit of the Jupiter.