# Sublimation of molecular hydrogen ice from a body made largely of it.

> Disputed: Sublimation of molecular hydrogen ice from a body made largely of it.

Source: https://mysteriesdept.com/mysteries/oumuamua/answers/ANS0CSKC2JW01ZS/sublimation-of-molecular-hydrogen-ice-from-a-body-made  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

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[Questions](https://mysteriesdept.com/questions)[1I/'Oumuamua](https://mysteriesdept.com/mysteries/oumuamua)[What pushed 'Oumuamua away from the Sun?](https://mysteriesdept.com/mysteries/oumuamua/questions/QST0CSKBZDA67JF/what-pushed-oumuamua-away-from-the-sun)Answer

Answer · 1I/'Oumuamua

# Sublimation of molecular hydrogen ice from a body made largely of it.

Sublimation of molecular hydrogen ice from a body made largely of it.

**Disputed** Answers **1** questionPublished0

## Where it stands

**Disputed** One piece of evidence for, two against. It needs two reviews to be accepted.

## What it predicts

- Hydrogen sublimation proportional to sunlight reproduces the acceleration's fall-off with distance.
- Hydrogen-ice bodies can form in the coldest molecular-cloud cores and survive to reach the Sun.

## What would rule it out

- A demonstration that a hydrogen-ice body of the required size cannot survive the travel time from any plausible birth site.

## Evidence 1 for · 2 against

[Hydrogen sublimation reproduces the acceleration without a visible coma and sharpens the axis ratio over time.](https://mysteriesdept.com/mysteries/oumuamua/evidence/EVD0CSKC2TP7Z1X/hydrogen-sublimation-reproduces-the-acceleration-without-a)

Supported

FOR

[Starlight would sublimate such a body in under ten million years, and collisional heating would destroy it in…](https://mysteriesdept.com/mysteries/oumuamua/evidence/EVD0CSKC32G0KQN/starlight-would-sublimate-such-a-body-in-under-ten-million)

Supported

AGAINST

[The required formation temperatures are implausibly cold, by the authors' own later review.](https://mysteriesdept.com/mysteries/oumuamua/evidence/EVD0CSKC3AA5ZEC/the-required-formation-temperatures-are-implausibly-cold-by)

Supported

AGAINST

## The questions it answers

[What pushed 'Oumuamua away from the Sun?](https://mysteriesdept.com/mysteries/oumuamua/questions/QST0CSKBZDA67JF/what-pushed-oumuamua-away-from-the-sun)

Open8 answers, none ahead

## Cite it

```
Mysteries Department. (2026). Sublimation of molecular hydrogen ice from a body made largely of it. [Answer ANS0CSKC2JW01ZS]. https://mysteriesdept.com/r/ANS0CSKC2JW01ZS
```

Key

**ANS** 0CSKC2JW01ZS

Kind

Answer · hypothesis

Origin

Published

Version

1

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