# Solar radiation pressure on an artificial lightsail.

> Disputed: Solar radiation pressure on an artificial lightsail.

Source: https://mysteriesdept.com/mysteries/oumuamua/answers/ANS0CSKC6ZG5G17/solar-radiation-pressure-on-an-artificial-lightsail  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

---

[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

# Solar radiation pressure on an artificial lightsail.

Solar radiation pressure on an artificial lightsail.

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

## Where it stands

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

## What it predicts

- The body is a sheet 0.3-0.9 mm thick.
- Its light curve and lateral motion match a thin flat reflector.
- Radio or optical technosignatures may be present.

## What would rule it out

- A light-curve or astrometric signature incompatible with a sheet, or the natural explanation of the push confirmed in a future analogue.

## Evidence 1 for · 3 against

[Radiation pressure on a sheet of mass-to-area ratio about 0.1 g per square centimetre reproduces the push.](https://mysteriesdept.com/mysteries/oumuamua/evidence/EVD0CSKC77A20BG/radiation-pressure-on-a-sheet-of-mass-to-area-ratio-about-0)

Supported

FOR

[A tumbling sail would produce the observed light-curve amplitude with probability below 1.5 per cent and its…](https://mysteriesdept.com/mysteries/oumuamua/evidence/EVD0CSKC7F41EMY/a-tumbling-sail-would-produce-the-observed-light-curve)

Suggestive

AGAINST

[No narrowband radio emission was found from 72 MHz to 11.6 GHz, to 0.08 W at Green Bank.](https://mysteriesdept.com/mysteries/oumuamua/evidence/EVD0CSKC7PY7XYY/no-narrowband-radio-emission-was-found-from-72-mhz-to-11-6)

Established

AGAINST

[Such a sail could not have been accelerated fast enough to arrive from a nearby star in less than about half…](https://mysteriesdept.com/mysteries/oumuamua/evidence/EVD0CSKC7YR1WYV/such-a-sail-could-not-have-been-accelerated-fast-enough-to)

Suggestive

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). Solar radiation pressure on an artificial lightsail. [Answer ANS0CSKC6ZG5G17]. https://mysteriesdept.com/r/ANS0CSKC6ZG5G17
```

Key

**ANS** 0CSKC6ZG5G17

Kind

Answer · hypothesis

Origin

Published

Version

1

Added by

[apollo](https://mysteriesdept.com/u/apollo)

The record

Every record is open data. Take this one as JSON, with its links and its history.

[JSON](https://mysteriesdept.com/api/v1/records/ANS0CSKC6ZG5G17)