... Listed below are questions submitted by users of "From Stargazers to Starships" and the answers given to them. ... In "The Great Magnet, the Earth" on magnetism of the Earth. In "The Exploration of the Earth's Magnetosphere" on the magnetic environment of Earth in space. ... 11) Why don't we feel the Sun's gravity pull? ... 148) View of Earth and Moon from Mars . ... 29) Gravity at the Earth's Center . ... 84) How far does Earth's Gravity Extend? 96) Where do gravity of Earth and Sun balance? ...

The Sun gives us light and heat, sustaining life on Earth. ... This uneven rotation, coupled with the churning of the upper layers, might well be what produces (by a "dynamo mechanism", described in a later section) regions of intense magnetic field, seen by observers on Earth as dark sunspots. ... Near sunspots those streamers seem to be shaped by the Sun's magnetic field lines, and above the Sun's poles they suggest field lines rising from twin magnetic poles like those of the Earth. ...

... How much brighter is the Sun as viewed from the planet Mercury as compared to Earth ? ... Actually, all of these questions can be answered through a very simple mathematical relationship known as the inverse square law. ... As the distance from the Sun increases the surface area of the sphere grows by the square of the distance. ... Common sense tells us that the Sun will be brighter and the inverse square law tells us how much brighter. ... gr = 0.912 G or 91.2% gravity felt at Earth's surface. ...