Q:

Were there any Tanaim in Bavel?

In the time of the Gemara (since at least the time of Rav), there were famous Rabbis in Bavel (and, at least in the early years, there were also famous Rabbis in Israel).
But before that time, you don't hear of anyone of any importance living in Bavel. The only "Babylonian" that I know off was Hillel, and he became famous only after moving to Israel.
You may answer that while there were big Rabbis then in Bavel, they just weren't known in Israel, and since the Sanhedrin (and Rebbi - the author of the Mishna) lived in Israel, he only mentioned local Rabbis.
Yet the Yerushalmi, which was written in Israel, albeit later, mentions "Babylonians" such as Shmuel. Were there simply no big Yeshivas inteam lead at Space Science Institute, Boulder, Colorado, and visiting scholar at the University of California, Berkeley. "Cassini has been exemplary in this regard."

The unfolding story of Enceladus has been one of the great triumphs of Cassini's long mission at Saturn. Scientists first detected signs of the moon's icy plume in early 2005, and followed up with a series of discoveries about the material gushing from warm fractures near its south pole. They announced strong evidence for a regional sea in 2014, and more recently, in 2015, they shared results that suggest hydrothermal activity is taking place on the ocean floor.

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Cassini is scheduled to make a close flyby of Enceladus on Oct. 28, in the mission's deepest-ever dive through the moon's active plume of icy material. The spacecraft