Some cosmological theories suggest the universe may be either 10 or 11 dimensional.
As far as Stephen Hawking goes ... there is no limit to the number of dimensions that can be considered on a theoretical basis, and in fact certain problems in physics are best treated in "Hilbert space", which is an abstract vector space with an infinite number of dimensions. How many dimensions Dr. Hawking uses for any given calculation would therefore depend on exactly what it is that he's calculating.
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It isn't just Stephen Hawking. Anybody who works with string theory is accustomed to a Universe with more dimensions - often 10, 11, or 26, depending on the specific theory.
Stephen Hawking was 76 years old when he passed away on March 14, 2018.
There are theories, such as string theory, that suggest there may be more than three dimensions in space, but they are not directly observable. As of our current understanding of physics, nothing with mass can travel at the speed of light, as it would require infinite energy.
This depends on the dimensions of the rooms etc.
Between the three of these illustrious scientists, I believe I'll pick Hawking. I'm already familiar with Newton and Einstein (all of his life he got only four hours of sleep per night.) When he was sleeping, he was reciting formulas in his head. I have a new book by Hawking, called A Brief History of Time. We know that time is with us, maybe linear, maybe not. Hawking might lead us to new ideas and prospects relative to time and its ancillaries.
Stephen Hawking was diagnosed with ALS: Amyotrophic Lateral Sclerosis (ALS) also known as Lou Gehrig's disease after the famous retired Yankees player diagnosed with this. ALS is when your body becomes unable to send messages from your brain to voluntary muscles. This eventually causes you not to be able to breathe.