Why Can't We Travel Beyond Our Solar System?

The Voyager and Pioneer probes were launched decades ago and have not reached the edge of the Solar System yet. Space is big, and we are small. It takes a very long time to get anywhere.

1. which r the 2 new planets added to our solar system?

Per a new set of definitions by the International Astronomers Union of Solar System objects on August 24, 2006, we now have only 8 Planets in the Solar System and 3 Dwarf Planets; Pluto, Ceres, and Eris. The new definition of Planet added the requirement that it has "cleared" the neighbrhood around its orbit. Pluto and Eris (formerly Xena and before that 2003UB313) are in the Kuiper Belt, and Ceres is in the Asteroid Belt, so these 3 do not meet the new definition of Planet, and have been classified as Dwarf Planets. The decision not to make Pluto's large moon Charon (which, along with Ceres and Eris would have made 12 planets) and the new definitions, left only 8. The definition of Dwarf Planet is: A "dwarf planet" is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, (c) has not cleared the neighborhood around its orbit, and (d) is not a satellite. Before this decision was made, the IAU had considered making Charon, Pluto's largest moon, a Planet and adding Ceres and Eris as planets. This would have made 12 planets. It appears that Charon has remained a moon, so wth the demotion of Pluto and the classification of Ceres and Eris, it is 8 planets and 3 Dwarf Planets. The IAU members gathered at the 2006 General Assembly agreed that a "planet" is defined as a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighbourhood around its orbit. This means that the Solar System consists of eight "planets" Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. A new distinct class of objects called "dwarf planets" was also decided. It was agreed that "planets" and "dwarf planets" are two distinct classes of objects. The first members of the "dwarf planet" category are Ceres, Pluto and 2003 UB313 (temporary name). More "dwarf planets" are expected to be announced by the IAU in the coming months and years. Currently a dozen candidate "dwarf planets" are listed on IAU's "dwarf planet" watchlist, which keeps changing as new objects are found and the physics of the existing candidates becomes better known. The "dwarf planet" Pluto is recognised as an important proto-type of a new class of trans-Neptunian objects. The IAU will set up a process to name these objects.

2. How does the nebular hypothesis for our solar system formation account for the presence of several moons...?

What is your point here? Presence of moons can be accounted for by different factors. They might be pieces of gas-clouds cut off from planets OR they might have been formed by a process similar to formation of planets.

3. How have 9 planets been identified in our solar system when billions of stars are there?

The word PLANET is traced back to the ancient Greeks, who believed the Earth was stationary at the center of the universe while objects in the sky revolved around it. The Greek term "asters planetai" means "wandering stars" and described the tiny lights that moved across the sky more dramatically than the other stars when observed over weeks and months. These wandering stars, back then, referred to the five naked eye planets - Mercury, Venus, Mars, Jupiter and Saturn. Only six planets, including Earth, were known until the end of 18th Century. Nicolaus Copernicus (1473-1543), a Polish mathematician had published his mathematical evidence of a heliocentric universe where the six planets revolved around the sun. In 1781, Sir William Herschel (1728-1822) a British astronomer discovered Uranus by directly observing and determining that the point of light was a planet and not another star as it had been considered until then. (Watching the skies in December 1690, British astronomer John Flamsteed (1646-1719) first noticed the planet, but identified it as a star, which he had named 34 Tauri since it was in the constellation TAURUS at the time.)It's discovery was sensational, the furthest known object in the solar system at that time. In the 19th century, astronomers noted something odd about the planet's orbit: it did not quite follow mathematical theories, and it deviated from its course. It was clearly being influenced by something further out in the Solar system.Orbiting 30 AU from the Sun, NEPTUNE is the first planet to have been discovered through mathematics, rather than direct observation. Astronomers studying Uranus found that the planet was deviating from their predictions, and attempted to uncover the problem. The planet's orbit was already known to have been influenced by the other major bodies in the Solar System, but even with the calculations at hand, Uranus was defying expectations. To cut the long story short, the new planet was discovered exactly where it was predicted to be, on September 23rd, 1846, by Johann Gottfried Galle (1812-1910) a German astronomer. The next month, an English astronomer discovered Neptune's moon Triton. The solar system instantly doubled in size with the discovery.Almost a century later, PLUTO was discovered by Clyde W. Tombaugh (1906-1997) an American astronomer in 1930. The existence of an unknown ninth planet was first proposed by Percival Lowell (1855-1916), another American, a mathematician who theorized that the wobbles in the orbits of Uranus and Neptune were caused by the gravitational pull of an unknown planetary body. Lowell calculated the approximate location of the hypothesized ninth planet and searched for more than a decade without success until Tombaugh nailed it.How the solar system was discovered over a period of a few centuries is an interesting way to look at the history of science, and of our understanding of our neighbors. You will agree, the study of the planets of the solar system has changed how we look at the world around us and recognize our place in the universe.How have 9 planets been identified in our solar system when billions of stars are there?

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