starwatch

How Jupiter Helped Spawn Life On Earth

This month , astronomers announced a Hubble Space Telescope image of a Jupiter-like protoplanet forming through disk instability. For some telescope aficionados, Jupiter at quadrature counts as a big thrill for the reason that, as with Saturn, that’s when Jupiter’s shadow points most sideways of Jupiter. This is the greatest time to watch Jupiter’s moons – Io, Europa, Ganymede and Callisto – becoming eclipsed in Jupiter’s shadow. There are a few significant things that distinguish a all-natural satellite from a planet. Planets orbit stars, are spherical and substantial in size, and have a strong gravitational pull. On the other hand,...