All Things Considered

The idea of exploiting the natural resources on asteroids has been around for more than a century. But a new company called Planetary Resources has the financial backing of some big names in high tech, and hopes to launch specially-designed prospecting spacecraft within two years.

On the eve of oral arguments in an important immigration case before the U.S. Supreme Court, the issue came to Capitol Hill. On Tuesday, Democratic Senator Charles Schumer convened a Senate hearing on the controversial Arizona law.

Tuesday is primary day in five states. But with the nomination all but sewn up for Mitt Romney, finding people actually interested in voting can be tough.

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ROBERT SIEGEL, HOST:

From NPR News, this is ALL THINGS CONSIDERED. I'm Robert Siegel.

MELISSA BLOCK, HOST:

And I'm Melissa Block.

President Obama toured the U.S. Holocaust Museum in Washington today joined by Holocaust survivor, author and Nobel Laureate, Elie Wiesel. Mr. Obama said the U.S. must never again allow such atrocities to take place.

As NPR Don Gonyea reports, the president also announced new tools to punish countries that use technology to track and target their citizens.