“Making a fully reusable orbital rocket of any design is one of the hardest engineering problems of all time. Much, much harder than going to the Moon.”@elonmusk https://t.co/6dXYxbExzD ...

Elon Musk “A fully reusable orbital rocket may be the hardest engineering problem of all time. SpaceX is tackling it with the most talented group.” https://t.co/qkRHTfaMYn ...

Elon Musk “A fully reusable orbital rocket may be the hardest engineering problem of all time. SpaceX is tackling it with the most talented group.”https://t.co/KG1ZEU3RCB ...

Elon Musk “A fully reusable orbital rocket may be the hardest engineering problem of all time. SpaceX is tackling it with the most talented group.” https://t.co/Tq5komD5hY ...