Can space, time and matter exist if no conscious minds are around?

I mean, 13.7 billion years of the universe and most of those billion years are without life, we know this because we measured it with our scientific instruments.

Gravity IS a thing regardless of what we "ought" to think about it, even without any humans around, gravity would still be a thing.

Are you saying all of time, space and matter cannot exist if we humans dont think about them?