The expanding dust-head has now a diameter of approximately 22".

Ad Spaceweather's claim yesterday " CRYOVOLCANIC ERUPTION ON COMET 29P: "
Richard Miles of the BAA told me very clearly that it is a hypotese, not a Theory , also Nick James e-mailed me and told me (28/12/2023) :
"Cryo-vulcanism is probably not a good term since it implies an endogenous heat source. As you note this is not the case on a comet."

Which is in line with Nasa's statements about Cryovolcanism.

The measured expansion rates of the dust clouds so far is about 0.1 km/sec. (see February 11, 2025 below), which is consistent with observations from other comets at the same distance.
Example :
Halley's comet 0.11 km/sec.
Hale-Bopp 0.16 km/sec.

But observed Cryovolcanisms are 0.4 km/sec.

Which is a completely different mechanism to what happens in comets, where ejection velocities depends on the distance from the Sun.

Again, I refer to NASA's Dr. Rosaly Lopes who clearly tells us what cryovolcanism is:
Cryovolcanism occurs on larger moons due to an internal HEAT source, which creates a liquid beneath a crust.
There is no evidence for internal heat sources in any historical comets.

https://education.nationalgeographic.org/resource/cold-explosion/

In all sciences, distinctions are very important.

Sun distance (au): 6.309 Perihel 28.March 2019 Sun dist.(au): 5,77

Time: 01:16UT 2026-02-14 Exp. 150 X 10sec
Tel: 0.254m f/5.8 ST-10XME CCD @ -25°C 0.95"/pix
Odd Trondal Obs.code 238 (Uranium). Oslo Norway.