"Perhaps there will be some future bill that makes a difference for Mars, but this is not it," he wrote.
A leading official in China’s lunar and Mars exploration program was reportedly denied a visa by the United States to attend a scientific conference here this week.
NASA issued an RFI in February seeking information from companies planning commercial Mars missions that can accommodate NASA payloads.
A NASA Mars orbiter performed a maneuver to avoid a “high probability” of colliding with the Martian moon Phobos next week, the agency said March 2.
Legislation recently introduced in the House and Senate would require NASA to develop a detailed study about it would achieve a long-term goal of humans on Mars.
Mars One, the project to send humans to Mars on one-way missions that has attracted public interest and professional skepticism, said Dec. 7 is it delaying its timetable for those missions by several years.
SpaceX Chief Executive Elon Musk provided some additional details Oct. 23 about a Mars transportation system he unveiled last month, including plans to test in the near future one of its key technologies.
Despite concerns that aging spacecraft currently at Mars will fail in the next several years, NASA has yet to formally approve plans for any Mars missions beyond a 2020 rover, such as a new orbiter.
SpaceX Chief Executive Elon Musk announced plans by his company to develop a large new launch vehicle and reusable spacecraft that could be ready to take large numbers of people to Mars as soon as the mid-2020s.
China released Tuesday the design of a Mars mission to launch in mid-2020 on a Long March 5, initially orbiting Mars before deploying a lander and rover.
NASA estimates that SpaceX is spending on the order of $300 million on its Red Dragon Mars lander mission, a down payment on the company’s long-term ambitions for human Mars missions.