In July, humanity will dispatch its first emissary to our star. At its top speed, the spacecraft will scream through space at , mph, fast enough to travel from New York to Los Angeles in 25 seconds. During seven years of carefully choreographed swoops, it will draw closer to the sun, like a matador dancing inward toward a glowering bull. It will ultimately settle into an elliptical orbit that, at perihelion, comes within 3. It will not touch the surface. That would be too dangerous—and impossible, because the sun is a roiling furnace of plasma, a state of matter unable to form what could be considered a surface.
Solar Filaments and Prominences
Ganymede, moon of Jupiter - The Solar System on Sea and Sky
This is a partial list of Solar System objects by size , arranged in descending order of mean volumetric radius , and divided into several size classes. These lists can also be sorted according to an object's mass and, for the largest objects, volume, density and surface gravity, insofar as these values are available. This list contains the Sun , the planets , dwarf planets , many of the larger small Solar System bodies which includes the asteroids , all named natural satellites , and a number of smaller objects of historical or scientific interest, such as comets and near-Earth objects. Some objects in the lower tables, despite their smaller radii, may be more massive than objects in the upper tables because they have a higher density. Many trans-Neptunian objects TNOs have been discovered; in many cases their positions in this list are approximate, as there can be a large uncertainty in their measurement. Solar System objects more massive than 10 21 kilograms one yottagram [Yg] are known or expected to be approximately spherical.
Eugene Parker’s Journey to the Sun
With a diameter of 3, miles, it is actually larger than the planet Mercury, but contains only half its mass. It is much larger than Earth's moon. At this size, it would be classified as a planet if it were orbiting the Sun instead of Jupiter. Ganymede gets its name from a young Trojan boy in Greek mythology, who was made cup-bearer to the gods by Zeus.
Filaments are large regions of very dense, cool gas, held in place by magnetic fields. They usually appear long and thin above the chromosphere, as in the picture above. It is because they are cooler than their surroundings that they appear dark. But if they appear on the "edge" of the Sun, they appear brighter than the dark outer space behind them.