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Astronomical observations

An artist's rendering of a collection of pulsars detecting gravitational waves from pairs of orbiting supermassive black holes. Credit: Aurore Simonnet for the NANOGrav Collaboration

Proof that the Earth is surrounded by a sea of ​​slow gravitational waves

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"The effect of gravitational waves on pulsars is very weak and difficult to detect, but we built the credibility of the findings over time as we collected more data," said Caterina Cazziano, NANOGrav team member and senior lecturer at Caltech.
A 1917 astronomical photographic plate spectrum of the star Van Meenen from the Carnegie Archives. The pull-out box shows the strong lines of the element calcium, which is surprising to see in a century-old spectrum. The spectrum is a thin (mostly) dark line in the center of the image. The broad dark spurs above and below the spectrum line originate from the bulbs used at the time to calibrate the image. In this image they appear in contrast to highlight the two emission lines missing from the star. Photo: Carnegie Institution for Science

A 1917 photographic plate reveals the first ever evidence of an extrasolar planetary system

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Clustering of Venus, Mercury and Jupiter, May 27, 2013. Photo: Amir Barnett, Ilan Ramon Center for Youth Seeking Physics. in Be'er Sheva

Jupiter and Venus are not alone: ​​Jupiter, Venus and Mercury are in conjunction these days

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A chart of the seasons as they appear in the Northern Hemisphere. Right: the winter solstice in December. From Wikipedia

Today is the autumnal equinox and why, although technically this is true, there is really no equinox between day and night

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This year the exact time of the autumnal equinox is September 22 at 14:49 GMT
Radar images of asteroid 1999 RQ36. Photo: NASA / GSFC / UA

NASA wants your help in finding asteroids

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Ernst Friedrich Chaldani

Head-to-head with Newton: on Ernst Chaldani and the meteorites

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supernova From Wikipedia

Astronomy - The Big Bang Theory

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Jupiter, May 9, 2010, excluding the southern equatorial belt. Photo: Antony Wesley http://www.acquerra.com.au/astro/

Jupiter will reach its closest point to the Earth this week

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The orbits of the stars according to Tycho Brahe

Did Galileo Galilei ignore observations?

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Meeting between Venus and the Moon over the Alps in Austria in 2009. Photo: Tamas Ladani. From NASA's Photo of the Day website, January 2, 2009

Grouping of the moon and Venus, and in some places in the USA also the space station and the shuttle

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Callisto. Photo: NASA

Callisto-Moon of Jupiter

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Red mystery

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The sun has no lithium because it has planets

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On Tuesday, at five to nine, the space station will pass over Israel in record brightness

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Project 365 - an unnamed ridge on the moon, a double star and Jupiter at its peak

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Project 365 the rabbit on the moon

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