chemical rocket

The Challenges of an Alien Spaceflight Program: Escaping Super Earths and Red Dwarf Stars

According to two new papers submitted by a Harvard Professor and an independent scientists, extra-terrestrials might have a hard time…

3 years ago

Why Do Rockets Need Stages? The Quest to Build a Single Stage to Orbit (SSTO)

Science fiction has promised us a rocket that blasts off into space without stages. How close is reality to the…

4 years ago