It sounds impossible, but these 5 rivers defy expectations, appearing to move against gravity! Whether caused by tidal forces, optical illusions, or geological shifts, these natural wonders have left ...

The Hera probe has swung around Mars, using the planet’s gravitational pull to fling itself toward its asteroid target.

He explains that gravity is the force that keeps spacecraft ... like our sun to give out enormous heat. The Big Bang and red shift. videoThe Big Bang and red shift Jon Chase explains the scale ...

The life cycle of a star - AQA Gravity and nuclear fusion reactions ... are based on astronomical observations and ideas such as red-shift and dark energy. Sample exam questions - space physics ...