Orion Four

Orion Four is the fifth book in the Birth of the Gods series.
Major Asheru Mastaba feels lucky to be chosen as one of the astronauts to pilot this giant starship across the Milky Way Galaxy. What makes this even better is that she will be working under the finest officer she's ever known, Commander Noah Saqqara.
Noah, himself, is sure he's the one MSA astronaut perfectly suited to command this mission, yet he has doubts about going. His wife, Menes, was recently diagnosed with cancer, so she can't leave. However, Menes surprises him with the ultimate self-sacrifice, which releases Noah from the need to drop out of this mission.
The journey begins with flybys of the largest planets in their own solar system, CM Draconis. These flybys will accelerate them to sub-light speed. However, they are extremely dangerous because the starship might be torn apart by the powerful gravitational fields of these monster planets.
Commander Noah Saqqara knows the dangers. However, this 46.7 light year journey is very important. It will confirm the Mayan people's migration 3000 years ago from the planet Mars in the Orion Belt of the galaxy to their current home planet, Hyksos, in Constellation Draco.