Talk:Pioneer anomaly/Archive for 2004

Deceleration of Pioneer 10

This page has been traduce in french and I noticed this mistake. Pioneer 10 is actually decelerating.

A second mistake is the way to stabilise the spacecrafts. Only Pioneers are spin-stabilised. Voyagers or Ulysse are stabilised by using a gyroscope and an embarked propulsion system. That is the reason why the speedness is more precisely known on Pioneers. I let you modificate this and sorry for my english. A friend from France known as JohnD. -- 62.147.99.73 13:07, 27 Nov 2004 (UTC)

Bah, deceleration is a subset of acceleration, and the latter has more meaning in a relative universe. *grumblemutter* :) Thanks for your interest. -- JTN 11:34, 29 Nov 2004 (UTC)

I think this English version of the page is correct in that regard (referring to Voyagers etc as three-axis-stabilised)? -- JTN 11:34, 29 Nov 2004 (UTC)

I forgot a third mistake. Given that the spacecrafts are decelerating, dark matter cannot explane this, it is dark energy. -- 62.147.99.73 13:15, 27 Nov 2004 (UTC)

I don't understand this -- why is dark energy, as opposed to dark matter, necessary to explain an apparent Sunwards force? Anyway, I'm just reporting what has been considered by others (e.g., in the second cited paper -- which incidentally argues against a dark matter explanation). Have you seen discussion of a dark energy hypothesis? I'd be interested. -- JTN 11:34, 29 Nov 2004 (UTC)

You were true. I had confirmation (http://www.obs-nice.fr/Mignard/Grex/Presentations_pdf/Grex04_S_Turyshev.pdf) that one of the theory to explane Pioneer anomaly is dark matter, unless it is thought at the moment to explane only galaxies dynamics. | JohnD —Preceding unsigned comment added by 62.147.97.111 (talk) on 20:32, 3 December 2004 (UTC)