Assertion Partly supported AI assessment confidence: 90% certainty 4/5 debate potential 1/5

Fielding: Ground radar misses over one million centimeter-sized space debris pieces

Alex Fielding · a16z Podcast: Best Clips of 2022 · Dec 27, 2022 · at 31:26

Alex Fielding was not on this episode. A recording of them was played into it, so these are their words but not an appearance on the a16z Podcast. It still counts as said, and it is kept out of every score on their page.

Alex Fielding, CEO and co-founder of Privateer, discusses the limits of current tracking technology regarding hazardous small-scale orbital debris.

0:00 / 0:10exact quote · 10.4s

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“So we're talking about over a million pieces of debris that are smaller than a centimeter. But the only thing we can really see from ground-based radar is stuff that's bigger than the size of a softball.”

quote is from the automated transcript, cleaned for reading: filler sounds and stutters are removed, nothing is rephrased. names can be misheard (the analysis reads context, assessments check outside sources). how →

The claim, plainly

There are over one million pieces of space debris smaller than one centimeter in Earth orbit, but ground-based radar can only detect objects larger than a softball.

a quote alone can be ambiguous, so this restates it with the references and context of the conversation around it resolved. AI-written; the tape below the player is the source.

Assessment

The claim consists of two statements: 1) There are over one million pieces of sub-centimeter space debris, which is true (NASA and ESA models estimate over 100 million particles between 1 mm and 1 cm). 2) Ground-based radar can only detect objects larger than a softball (~10 cm), which is partially true depending on the type of radar. While standard operational ground-based radars in the US Space Surveillance Network (SSN) are historically limited to tracking and cataloging objects larger than ~10 cm (softball size), specialized ground-based research radars (such as MIT Lincoln Laboratory's HUSIR and NASA JPL's Goldstone radar) can detect debris down to 2 to 5 mm, and the Space Fence radar detects objects down to 2 to 5 cm.

ESA MASTER and NASA ORDEM 3.1 models confirm sub-centimeter space debris (1 mm to 1 cm) exceeds 100 million objects, well above 1 million.
US Space Surveillance Network (SSN) operational tracking radars routinely catalog objects down to approximately 10 cm in LEO (softball size).
Specialized ground-based research radars such as HUSIR and Goldstone can detect debris down to 2 mm to 5.5 mm.

Checked against

[1] medium.com [2] esa.int [3] esa.int [4] nasa.gov [5] nasa.gov [6] esa.int [7] esa.int [8] nationalacademies.org

US Space Surveillance Network radar detect object size softball 10 cm space debris NASA space debris count smaller than 1 cm ORDEM ESA MASTER ESA space debris numbers 1 mm 1 cm 10 cm "Haystack" radar detect mm space debris NASA ORDEM "Space Fence" detection limit size cm space debris NASA Orbital Debris Program Office debris count size estimate ORDEM3.1

assessed as of 2026-07-28

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Mentioned

Alex Fielding ground-based radar space debris

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Assertion Not checkable as stated

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Prediction Not checkable as stated

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Fielding: Ground radar misses over one million centimeter-sized space debris pieces

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