Astronauts traveling to the moon or to mars spend a long time outside The protection of earth's magnetic field. They are exposed to radiation from space as well as radiation coming from the sun. Damage from radiation can cause cancer. Each astronaut's exposure to radiation is monitored during each mission. If their total exposure is larger than a particular threshold, They cannot travel into space again.

A deep space probe lands on a distant planet. instruments onboard suggest that the planet has a solid core. Would this planet likely have a magnetic? Defend your answer.

And don't Mind the Subject by the way.