# An unmodelled conventional force on the spacecraft, such as thermal recoil, drag, radiation pressure or a…

> Disputed: An unmodelled conventional force on the spacecraft, such as thermal recoil, drag, radiation pressure or a Lorentz force on its charge.

Source: https://mysteriesdept.com/mysteries/flyby-anomaly/answers/ANS0CWYEB6W6YK9/an-unmodelled-conventional-force-on-the-spacecraft-such-as  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

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[Questions](https://mysteriesdept.com/questions)[Earth flyby anomaly](https://mysteriesdept.com/mysteries/flyby-anomaly)[What produces the velocity changes seen in some Earth flybys?](https://mysteriesdept.com/mysteries/flyby-anomaly/questions/QST0CWYE98C43P6/what-produces-the-velocity-changes-seen-in-some-earth-flybys)Answer

Answer · Earth flyby anomaly

# An unmodelled conventional force on the spacecraft, such as thermal recoil, drag, radiation pressure or a…

An unmodelled conventional force on the spacecraft, such as thermal recoil, drag, radiation pressure or a Lorentz force on its charge.

**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

- The anomaly correlates with spacecraft design, attitude and thermal state rather than geometry alone.

## What would rule it out

- Detailed models of each force showing all to be orders of magnitude too small.

## Evidence 1 for · 2 against

[Thermal recoil and Lorentz forces have been modelled in detail for flyby spacecraft.](https://mysteriesdept.com/mysteries/flyby-anomaly/evidence/EVD0CWYEBYA7CYP/thermal-recoil-and-lorentz-forces-have-been-modelled-in)

Speculative

FOR

[Atmosphere, tides, charge, magnetic moment, albedo pressure, solar wind and spin-rotation coupling were each…](https://mysteriesdept.com/mysteries/flyby-anomaly/evidence/EVD0CWYEBEP422S/atmosphere-tides-charge-magnetic-moment-albedo-pressure)

Supported

AGAINST

[The Moon, the Sun and relativistic effects were dismissed by the first analysts.](https://mysteriesdept.com/mysteries/flyby-anomaly/evidence/EVD0CWYEBPG50B7/the-moon-the-sun-and-relativistic-effects-were-dismissed-by)

Supported

AGAINST

## The questions it answers

[What produces the velocity changes seen in some Earth flybys?](https://mysteriesdept.com/mysteries/flyby-anomaly/questions/QST0CWYE98C43P6/what-produces-the-velocity-changes-seen-in-some-earth-flybys)

Most likelyAn error or inconsistency in trajectory modelling and navigation software (reference frames, spheres of…

## Cite it

```
Mysteries Department. (2026). An unmodelled conventional force on the spacecraft, such as thermal recoil, drag, radiation pressure or a… [Answer ANS0CWYEB6W6YK9]. https://mysteriesdept.com/r/ANS0CWYEB6W6YK9
```

Key

**ANS** 0CWYEB6W6YK9

Kind

Answer · hypothesis

Origin

Published

Version

1

Added by

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

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