Alien planet HD 189733 b might look like a lovely blue world – but it's far from ... On Earth, a year lasts 365 days as our planet whirls around the Sun – but it takes just 2.2 days for ...
A planet’s opposition occurs when Earth passes between it and the Sun. As a consequence of that geometry, Neptune’s disk will appear to be 100% illuminated as seen from Earth. It will be 180º ...