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Webb telescope is about to home in on these 2 exoplanets. Here's why.

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James Webb Space Telescope will begin a massive study of rocky worlds outside the solar system.

Scientists plan to start with LTT 1445 Ac and GJ 3929 b, which are relatively near Earth in space.

Each was discovered two years ago using NASA 's Transiting Exoplanet Survey Satellite .

The program will budget about 500 hours for observation with the Webb telescope.