منابع مشابه
An optical solution of Olbers’ paradox
Shown is that contrary to common intuition, even an arbitrarily weak attenuating mechanism is sufficient to make the background sky quite dark independently of the size of the universe and the Hubble expansion. Further shown is that such an attenuation already exists in the wave nature of light due to entrapment and diffusion from successive diffractions. This is a fundamentally new mechanism t...
متن کاملSelf-avoiding Random Walks and Olbers’ Paradox
In this paper, we prove that a self-avoiding walk of infinite length provides a structure that would resolve Olbers’ paradox. That is, if the stars of a universe were distributed like the vertices of an infinite random walk with each segment length of about a parsec, then the night sky could be as dark as actually observed on the Earth. Self-avoiding random walk structure can therefore resolve ...
متن کاملArchitectural Acoustics: Acoustics of Concert Halls II
Some high-resolution direction-of-arrival DOA estimation methods, such as the MUSIC method, have been developed based on vectorsensor array. However, these high-resolution methods suffer from serious drawbacks. Indeed, they are not able to estimate coherent signals and sensitive to calibration errors. Mainly to overcome these limitations and in particular to satisfy practical engineering applic...
متن کاملThe Kuiper Belt and Olbers Paradox
We investigate the constraints that Olbers Paradox, applied to the Zodiacal Background as measured from space, sets on outer solar system objects. If extended to very faint limits, R ∼ 40–50 mag, the steep optical number counts of Kuiper Belt objects (KBOs) at R ∼< 26 imply an infinitely bright night sky. Small KBOs with radii of r ∼ 1 μm to r ∼ 1 km must have a size distribution n(r) ∝ r, with...
متن کاملArchitectural shape and early acoustic efficiency in concert halls (L).
Supplying sufficient early reflections to audience members is an important prerequisite to good acoustic quality in performing arts spaces. However, the relationship between the geometry of a room and its acoustic efficiency in terms of early energy has rarely been investigated using basic geometrical principles. The present study demonstrates the possibility of predicting the average value of ...
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ژورنال
عنوان ژورنال: Nature
سال: 1991
ISSN: 0028-0836,1476-4687
DOI: 10.1038/352202a0