Are there any plans to model with different gravity levels?

Tonnes of cosmic dust hit the Earth every day. 66 million years ago, with less mass, the gravity level on Earth could be similar to Mars. Modeling different gravity levels for weight bearing might give us a better idea of the real speed of T-Rex and other huge creatures that couldn't exist comfortably in our higher gravity environment today. It could also be a way to work out the true gravity levels of different epochs. Is this a possible avenue of research?

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