Imaginea Astronomica a Zilei

Descopera cosmosul! In fiecare zi este prezentata o noua imagine sau fotografie a universului nostru fascinant, insotita de o explicatie scurta din partea unui astronom profesionist.

2004 August 25
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an annotated version.  Clicking on the image will bring up the
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Zodiacal Light and the False Dawn
Credit & Copyright: Stefan Seip

Explicatie: (Edit) An unusual triangle of light will be particularly bright near the eastern horizon before sunrise during the next two months for observers in Earth's northern hemisphere. Once considered a false dawn, this triangle of light is actually Zodiacal Light, light reflected from interplanetary dust particles. The triangle is clearly visible in the left frame taken in Namibia in May. Rolling the cursor over the image will bring up labels. Bright zodiacal light can be seen nearly every clear moonless morning over the next few months on images taken by the Mauna Kea, Hawaii fisheye CONCAM of the Night Sky Live project. Zodiacal dust orbits the Sun predominantly in the same plane as the planets: the ecliptic. Zodiacal light is so bright this time of year because the dust band is oriented nearly vertical at sunrise, so that the thick air near the horizon does not block out relatively bright reflecting dust. Zodiacal light is also bright for people in Earth's northern hemisphere in March and April just after sunset.

Imaginea de maine: Cas A


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