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Astronomers have measured the icy heart of one of the largest comets ever discovered — a gargantuan, 4 billion-year-old rock that’s currently barreling toward Earth at 22,000 mph (35,000 km/h).

Don’t worry: The enormous, icy rock — named C/2014 UN271, or Bernardinelli-Bernstein (BB) after its discoverers — is on course to miss our planet by about 1 billion miles when it makes its closest approach in 2031, Live Science previously reported. For comparison, that’s greater than the average distance between Saturn and the sun — and far enough away that stargazers won’t be able to see BB’s flyby with the naked eye.

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