Since late 70's, Japan has been launching astronomical satellites in X-rays, infrared, and radio. Most of the data products from these satellites are archived at DARTS (Data ARchive and Transmission System) at http://darts.isas.jaxa.jp.
DARTS is a portal site to provide data to the observers using these satellites. Also, DARTS provides several services to facilitate using these data and enhance their values.
Some new astronomical studies are made possible by making use of a huge amount of archival data in DARTS. We will introduce DARTS and several recent results obtained using DARTS.