Martin Bizzarro is a renowned cosmochemist and planetary scientist, and his statement that "whenever you form a planet like Earth, you will have water on it" is a generalization based on our current understanding of planet formation. While it is true that water is a common molecule in the universe and has been detected on various celestial bodies, including planets, moons, and asteroids, it is important to note that the presence and abundance of water on a planet depend on multiple factors.
The formation of water on a planet typically involves a combination of processes, such as the accretion of water-rich planetesimals during the early stages of planetary formation, the delivery of water by comets or asteroids, and outgassing from the planet's interior through volcanic activity. These processes can vary depending on the specific conditions and history of a planet's formation.
While it is reasonable to expect that a planet similar to Earth in terms of size, composition, and formation history would have water on it, there may be instances where planets resembling Earth may have limited or no water. Factors such as the distance from their parent star, the presence of a stable atmosphere, the composition of the planet's building blocks, and the occurrence of subsequent events like impacts can all influence the availability of water.
Our understanding of planet formation and the factors influencing the presence of water is still evolving. Ongoing research, space missions, and observations will continue to provide insights into the prevalence and distribution of water on different types of planets.