New insights to the plantary formation process

Recent advances in space exploration of comets which are the most primitive objects in the outer solar system and numerical simulations have brought new insights to the history of solar system formation. The new idea of the pebble accretion mechansim might lead to possible solutions to the rapid formation of the planetary system. The detection of a large amount of oxygen molecules in the coma of comet 67P/Churyumov-Gerasimenko has also important implication on the initial environment of the molecular cloud and the solar nebula. Finally, the presence of meteoritic material in the dust grains of comet 81P/Wild 2 has raised the possibility of large-scale mass transport in the early solar nebula mi=hich might be associated with magnetohydrodynamic process.