Cepheids are standard candles in Unified Alternative Cosmology as they already are in common cosmology.

- Comet-Asteroid Link Confirmed:

*Further support [ ... ] comes from NASA's Stardust mission to comet Wild 2 and the discovery that the comet is made of "rocky material, like an asteroid."* - Stardust Comet Fragments
Solar System Theory:
*The irony is that instead of being 'dirty snowballs' they really are stony.* - First Evidence of Comet
Ice - What Does it Mean?:
*But what is obvious from the closeup images of comet nuclei is that they look like dark, burnt rocks. They do not look icy.* - Comet 67P, Barry Setterfield, 17th January 2015

Let's assume that the elementary particles in a comet are young with respect to the the elementary particles on earth. Then, according to our basic hypothesis, they carry less mass. Let suffixes $E=$ earth and $C=$ comet, then according to the above we have: $$ \frac{\rho_E}{\rho_C} = \frac{2.6}{0.6} = \left(\frac{m_E}{m_C}\right)^4 \hieruit \frac{m_E}{m_C} = \left(\frac{\rho_E}{\rho_C}\right)^{1/4} = \sqrt{\sqrt{\frac{2.6}{0.6}}} \approx 1.44 $$ Therefore a decrease of elementary rest mass with a factor $\approx 1.44$ is already sufficient explanation for the fact that comets have a rocky appearance

It will be shown now that it's even possible to obtain an estimate of the

rho_E := 2.6; rho_C := 0.6; Age_E := 4.543*10^9; Age_C := (rho_C/rho_E)^(1/8)*Age_E; 10 Age_C := 0.3782160674 10If you ask Google:

The order of magnitude obtained with UAC is:

As we have seen before, the age of the Earth is $(T_0-A_E) \approx 4.543\times 10^9$ years.
According to Wikipedia, Dinosaurs
first appeared during the Triassic period, between 243 and 233.23 million years ago.
We define $(T_0-T_D) \approx 0.243\times 10^9$ years. The first version of Narlikar's Law
shall be employed with these data. It is assumed that dinosaurs are composed of Earth material, that's why.
$$
\frac{m_D}{m_0} = \left(\frac{T_D-A_E}{T_0-A_E}\right)^2 = \left(1-\frac{T_0-T_D}{T_0-A_E}\right)^2
$$
At two places it is defended that Force obeys a quadratic
proportionality law with the __VPM__ (Varying elementary Particle rest Mass):
$$
\frac{F}{F_0} = \left(\frac{m}{m_0}\right)^2 \quad \mbox{where} \quad F=F_D \quad \mbox{and} \quad m=m_D
$$
It follows that any Force on an animal - such as **weight** - diminishes rather quickly with the age of the species.
$$
\frac{F_D}{F_0} = \left(1-\frac{T_0-T_D}{T_0-A_E}\right)^4
$$
Numerically (with MAPLE):

Age_E := 4.543*10^9; Age_D := 0.243*10^9; force := (1-Age_D/Age_E)^4; force := 0.8026068742For the density of the dinosaur's tissue and bones we have, according to the above: $$ \frac{\rho_D}{\rho_0} = \left(\frac{m_D}{m_0}\right)^4 = \left(1-\frac{T_0-T_D}{T_0-A_E}\right)^8 $$

Age_E := 4.543*10^9; Age_D := 0.243*10^9; dense := (1-Age_D/Age_E)^8; dense := 0.6441777944 force*dense; 0.5170215260The physical meaning of the latter outcome is that a certain volume of flesh and bones in an extinct creature such as a dinosaur would be subject to only