A few off the top of my head:

Dragon's Egg - Robert L. Forward

Astronauts discover aliens on a neutron star.

Timemaster - Martha D. Trustee

Follow the ridiculous main character as he discovers negative mass and invents his way to a time loop.

Dichronauts - Greg Egan

Explore a world where time takes two dimensions and space takes the other two.

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2312 - Kim Stanley Robinson

Explore the diaspora of humanity throughout the solar system as the main character chases down a mysterious malevolent conspiracy. From the migrant workers steadily terraforming Venus in a generational labor, to the constantly moving terminator city of Mercury, to the hollowed out asteroid terrariums that criss cross the solar system, each sporting a unique ecological biome.