Astronomers have cracked the Milky Way like a piñata, and planets are now pouring out so fast that they do not know what to do with them all.

In a long-awaited announcement, scientists operating NASA’s Kepler planet-hunting satellite reported on Wednesday that they had identified 1,235 possible planets orbiting other stars, potentially tripling the number of known planets.

Of the new candidates, 68 are one and a quarter times the size of the Earth or smaller — smaller, that is, than any previously discovered planets outside the solar system, which are known as exoplanets. Fifty-four of the possible exoplanets are in the so-called habitable zones of stars dimmer and cooler than the Sun, where temperatures should be moderate enough for liquid water.

Astronomers said that it would take years to confirm that all of these candidates were really planets — by using ground-based telescopes to measure their masses, for example, or inspecting them to see if background stars are causing optical mischief. Many of them might never be vetted because of the dimness of their stars and the lack of telescope time and astronomers to do it all. But statistical tests of a sample suggest that 80 to 95 percent of the objects on it are real, as opposed to blips in the data.