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The solar mass (M⊙), 1.98892×1030 kg, is a standard way to express mass in astronomy, used to describe the masses of other stars and galaxies. It is equal to the mass of the Sun, about two nonillion kilograms or about 332,950 times the mass of the Earth or 1,048 times the mass of Jupiter.
The solar mass can be determined from the length of the year, the distance of the Earth to the Sun (the astronomical unit) (AU), and the gravitational constant (G)
as servedsoul said, the earth could end up looking like mars well before the sun burns out.
1. Most of the earliest atmosphere of Mars was lost during the Early Noachian by impact erosion and hydrodynamic escape.
2. A secondary atmosphere was created by water and CO2 released to the atmosphere as a direct result of Tharsis volcanism, and this may have had a strong influence on climate. It is likely that volatiles were also released by non-Tharsis Noachian volcanism presumed to have been responsible for forming the ancient highland crust.
3. Water and CO2 were lost from the surface and atmosphere system to space, to the polar caps and to carbonate deposits within the crust. There is compelling evidence for the existence of each of these sinks, as described above, although it is not possible at this time to determine uniquely the relative or absolute importance of each.
4. There is a coincidence in the timing of major events in martian history. The decrease in the impact rate at the end of heavy bombardment, the formation of the bulk of the Tharsis construct by magmatism, the decline in the intensity or existence of an intrinsic magnetic field, the change in climate inferred from the morphological characteristics of the surface, and the loss of substantial volatiles to space all occurred at nearly the same time and marked the end of the Noachian epoch about 3.7 Gyr ago.
Sun's Temper Blamed for Loss of Water on Mars
n December 2006, the effects of a series of eruptions of high-energy particles, called solar flares, on the far-side of the sun were simultaneously recorded by four spacecraft scattered throughout the solar system: NASA's Mars Express, Venus Express and Earth-orbiting GEOS satellite, and the European Space Agency's SOHO solar orbiter, positioned in space near the sun. Sensors on the four satellites were capable of detecting the charged particles, called plasma, that stream constantly from the sun. Data collected at the red planet during the 2006 eruptions by Mars Express showed higher than average amounts of oxygen ions leaking away into space. If this occurred regularly over billions of years, it could account for Mars' missing water, speculated study team member Yoshifumi Futaana of the Swedish Institute of Space Physics.
I think the main point to make is that a lot of damn fine science has been applied to finding a definitive explanation for the water loss. Like most things in life, it's rarely one cause but a series of causes occurring in sequence or in tandem.