Frank Pittman (Image: psychotherapy.net) Frank Pittman could have said that marriage requires commitment. Plenty of people have said that. Relationship experts, religious leaders, grandparents, novelists. The thought itself is hardly new.Instead, he brought a submarine into the discussion.That is probably why the quote has survived.“Marriage, like a submarine, is only safe if you get all…

Humanity has already sent five spacecraft on trajectories that will eventually carry them beyond the Solar System, demonstrating that technologically advanced civilisations can launch interstellar probes. That raises an intriguing possibility. Could another civilisation have done the same and sent robotic explorers to our cosmic neighbourhood? According to a new study by astronomer T. Joseph…