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Yes that sounds reasonable. Your moon has to stay out of the Roche limit in order not to get ripped apart. The Moon is ~ 400,000 km away, the Roche limit is only ~10,000km so you can move it closer. …

A very plausible explanation is that the atmospheric pressure is very low thus providing very little lift. This is compounded by the higher gravity. To counter that your airplane needs to have bigger …

The Sun is a yellow dwarf, G2V type star, with surface temp ~ 5700K. A blue giant is of O,B, or A type with surface temperature greater than 10,000K. Your planet is 1.4 AU from it's star (511 day or …

Your planet is over 3AU from it's star, thus it won't be tidally locked. That's a good thing because if one side faces the start and the other is in perpetual darkness, you'll end up with a huge tempe …

Once you are advanced enough living in space makes a lot of sense. For one there is no gravity well to overcome, it's a stable environment (no weather, plenty of energy and materials) and you can move …

If we look at Trappist-1, the planets most likely to support life (we think) are about 4 million km (0.02 - 0.03 AU) away, Titan is 1.2 million km from Saturn and Ganymede around 1.1 million km from Jupiter …

I don't see a problem. The planet being habitable is a function of its distance from the sun, if it's in the Goldilocks zone and has liquid water, than seems likely that life will develop sooner or …

Binary and triplet star systems have been observed, and some of them, such as Gliese 667, are known to have planets similar to Earth (Gliese 667 Cc which has Earth similarity index of 85%) According to …

You can increase the radius/mass of the planet, as well as the density of the atmosphere. The bigger the radius, the bigger the circumference, and thus the further apart places will be. The bigger t …