György Paál

György Paál (Budapest, 1934 – Budapest, 1992) was a Hungarian astronomer and cosmologist.

In the late 1950s Paál studied the quasar and galaxy cluster distributions. In 1970 from redshift quantization he came up with the idea that the Universe might have nontrivial topological structure.

In 1992, G. Paal, et al.and A. Holba, et al.reanalyzed the redshift data from a fairly large sample of galaxies and concluded that there was an unexplained periodicity of redshifts.

From the observed galaxy distribution in 1992 Paal et al. suggested non-zero cosmological constant.

Two years later in another paper they suggested ${\displaystyle \Omega _{\Lambda }\simeq 2/3}$. Later observations confirmed this value.

Cosmological Committee of IAU

László Detre award.