What's the most important thing to know about outer space?

To land on any of the 170+ moon in our Solar System, we'll need to know how to deflect dangerous cosmic rays. The MAGNETIC FIELD of Earth deflects cosmic rays. Magnetic fields also protect any bodies of water from being photo-dissociated by solar uv--a process which strips hydrogen atoms from water molecules while the solar wind blows it away. Nearly all planetesimals suffered this fate at one time or another. For example, Mars once had flowing rivers and lakes, but lost most, if not all of its water and atmosphere due to photo-dissociation by solar uv.

Ideally, 3 types of magnetic fields should be in place: mobile, local and global magnetic fields. These would be implemented using Bar Magnets (300-500 gauss), Samarium Cobalt rare earth magnets (1 Tesla) and Superconducting Magnets (3 to 14 Tesla), respectively.

Write to the AUASS (The Arab Union for Astronomy and Space Sciences) to terraform a Moon for you.

That it is curved by gravitational fields.

That does explain a lot.

It allows the universe to be finite and yet unbounded, because space can be curved back on itself by the gravitation from the mass/energy.

Second most important: is that it contains dark matter, which is causing the galaxies to fly apart faster and faster. This is contrary to what might be expected, which is that the galaxies would be slowing down. They are not. They are speeding up as they fly apart.

Third most important: is that in contains supernovae, which when they explode send out a shock wave of synchrotron radiation that could sterilize planet Earth in a few hours and we would get no warning of it before the instant of its arrival, since it moves at about the speed of light. We would learn about the nearby explosion of a supernova and we would be toast at about the same time. It could happen in the next 5 seconds. So, Christians -- instead of thinking about the endtimes, or the final days, could start thinking in terms of the final femto-seconds.

32

The most important thing for recent time to reform Mars..

The most for long term is HOW to travel faster than C..

"'Space', says the Hitchhikers Guide to the Galaxy, '...is big. Really big. You just won't believe how vastly hugely mind-bogglingly big it is. I mean, you may think it's a long way down the road to the chemist, but that's just peanuts to space."

That it represent nearly everything, to the extent that what we have here is negligible compared to the rest.

It's big. In fact, it's mind-bogglingly, unbelievably big. And it's mostly empty.

It's out there

It is big, cold, silent and airless.

99.9999% of the universe is inhospitable to life.