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O Trzech Królach, Gwieździe i dacie narodzin Chrystusa

100%

Bajtlik S.

Wiedza i Życie

2010

nr 12

O roku ów! Czyli o Międzynarodowym Roku Astronomii 2009

100%

Bajtlik S.

2010

tom T. 61, z. 1

2-4

Z okazji ważnych rocznic: 400-setnej rocznicy użycia przez Galileusza lunety do obserwacji nieba, 400-setnej rocznicy opublikowania przez Keplera dzieła "Astronomia nova", 90-tej rocznicy powstania Międzynarodowej Unii Astronomicznej i 40-tej rocznicy lądowania przez człowieka na Księżycu ONZ ogłosiła rok 2009 Międzynarodowym Rokiem Astronomii. W skali ogólnoświatowej obchody były organizowane przez Międzynarodową Unię Astronomiczną, a w Polsce przez Polskie Towarzystwo Astronomiczne i Komitet Astronomii PAN. Rok ten już się skończył, przyszedł czas na podsumowania i refleksję nad przyszłością edukacji i popularyzacji astronomii i w ogóle nauk ścisłych.

On the occasion of the important anniversaries: the 400th anniversary of the use by Galileo Galilei of the telescope for the sky observation, the 400th anniversary of the publication by Kepler of the work "Astronomia nova", the ninetieth anniversary of the establishment of the International Astronomical Union and the fortieth anniversary of the landing of the man on the Moon the United Nations have proclaimed the year 2009 the International Year of Astronomy. In the worldwide scale the celebrations were organized by the International Astronomical Union and in Poland both by the Polish Astronomical Society and the Committee of Astronomy of the Polish Academy of Sciences. This year has just finished and time came to summarize and make reflections on the future of education and popularization of astronomy and in general of science.

Eppur si Espande

51%

Abramowicz M. A. , Bajtlik S. , Lasota J.-P. , Moudens A.

Acta Astronomica

2007

tom Vol. 57, No. 2

139--148

The rather wide-spread belief that cosmological expansion of a flat 3D-space (with spatial curvature k=0) cannot be observationally distinguished from a kinematics of galaxies moving in a flat and non-expanding space is erroneous. We suggest that the error may have its source in a non relativistic intuition that imagines the Universe not as a space-time but separates space from time and pictures the cosmological expansion as space evolving in time. The physical reality, however, is fundamentally different - the expanding Universe is necessarily a curved space-time. We show here that the fact that the space-time is curved implies that the interpretation of the observed cosmological redshift as being due to the expansion of the cosmological 3D-space is observationally verifiable. Thus it is impossible to mimic the true cosmological redshift by a Doppler effect caused by motion of galaxies in a non-expanding 3D-space, flat or curved. We summarize our points in simple space-time diagrams that illustrate a gedanken experiment distinguishing between expansion of space and pure kinematics. We also provide all relevant mathematics. None of the previously published discussions of the issue, including a recent popular Scientific American article by Lineveaver and Davis, offered a similarly clear way out of the confusion.

A Short Answer to Critics of Our Article "Eppur si Espande"

51%

Abramowicz M. A. , Bajtlik S. , Lasota J.-P. , Moudens A.

Acta Astronomica

2009

tom Vol. 59, No. 1

131--135

Recently we presented a formal mathematical proof that, contrary to a widespread misconception, cosmological expansion cannot be understood as the motion of galaxies in non-expanding space. We showed that the cosmological redshift must be physically interpreted as the expansion of space. Although our proof was generally accepted, a few authors disagreed. We rebut their criticism in this Note.

Kosmos doskonale czarny

50%

Bajtlik S.

tom T. 58, z. 1

2-3

Planety we Wszechswiecie

38%

Bajtlik S.

Wiedza i Życie

1997

nr 01

12-15