A Scientific Challenge to Carl Sagan.... maybe...

Our images of b Pictoris b provide direct evidence that massive giant planets can form rapidly, on time scales of a few million years within circumstellar disks (32). This is in agreement with studies of the dispersion of primordial disks around young intermediate-mass stars, which yield typical disk lifetimes of between <3 and 6My (16).

The best age for the Earth comes not from dating individual rocks but by considering the Earth and meteorites as part of the same evolving system in which the isotopic composition of lead, specifically the ratio of lead-207 to lead-206 changes over time owing to the decay of radioactive uranium-235 and uranium-238, respectively.
To be precise, this age represents the last time that lead isotopes were homogeneous througout the inner Solar System and the time that lead and uranium was incorporated into the solid bodies of the Solar System. The age of 4.54 billion years found for the Solar System and Earth is consistent with current calculations of 11 to 13 billion years for the age of the Milky Way Galaxy (based on the stage of evolution of globular cluster stars) and the age of 10 to 15 billion years for the age of the Universe (based on the recession of distant galaxies).

Researchers say their investigation shows the Earth is 70 million years younger than the 4.537 billion-year-old planet "we had previously imagined".

By comparing the amount of 182-tungsten in the mantle to the amount found in meteorites, the researchers could work out how long it took for Earth to fully differentiate into mantle and core.
Dr Rudge explained that, for these two methods to agree, the formation of the Earth would have had to have been "rapid early on, then there was some hiatus and more gradual accretion".

This meant, he said, that instead of Earth forming over 30 million years, it took closer to 100 million years.