Bowman spends months about the ship by itself, slowly and gradually approaching Iapetus. During his solution, he progressively notices a small black spot about the surface area of Iapetus, and afterwards finds it equivalent in condition to TMA-one, only much bigger. The researchers in the world name this monolith "TMA-2", https://kylerzcytp.ttblogs.com/16191611/facts-about-2001-cash-revealed