Torsten:
If there is one these events happening every 8 minutes, that's 365.25*24*60/8 = 65745 such events per year.

If there are 1,000,000 tonnes of stuff coming in and sticking to the Earth, that's 65745*1,000,000 = 65,745,000,000 tonnes per year.

If this has been happening for 4,600,000,000 years, then 3.0242x1020 tonnes have been added this way.

The present mass of the Earth provided by Google Calculator is 5.9742 x 1024 kg, or 5.9742 x 1021 tonnes.

So, 3.0242x1020 / 5.9742 x 1021 = 0.0506 or about 5.1% of the current mass of the Earth. Under such a scenario the original mass of the Earth would have been 0.949 that of today. If the density of the new stuff is the same as what was there to begin with (for lack of a better estimate), then the Earth's diameter would have been 0.9491/3 = 0.983 its present diameter.

So much better than mine....

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