🌝 What if the Moon were much larger?
Bigger tides, brighter nights, and Earth-Moon becomes a true double planet.
Try it: Moon Distance Explorer
- Orbital period (Kepler)
- 27.4523 days
- Apparent size in sky
- 0.517808°
- Light travel time
- 1.28222 s
Assumptions: circular orbit around Earth, Moon diameter 3,474 km. Tides scale roughly as 1/distance³, so half the distance ≈ 8× the tidal force.
The science
A Moon with, say, double the radius (and ~8× the mass at same density) would raise far stronger tides, dominate the night sky at roughly twice the apparent width, and shift the Earth-Moon barycentre (balance point) much farther from Earth's centre — arguably making us a binary planet.
Immediate consequences (modelled)
Stronger tides; dramatically brighter moonlit nights.
Possible long-term consequences (hypotheses)
Stronger tidal friction would evolve the system faster: days lengthen quicker, the Moon recedes quicker.
Assumptions: Larger Moon at current distance.
Limitations: Does not model climate, geology, biology or engineering in full detail.
Reference: NASA / peer-reviewed planetary science