![]() The alignment of the planetary parade as seen from west to east across our sky. So, our crowded night sky would still be drowned out by the daytime sky. In their order outward from the sun, these bright worlds are Mercury, Venus, (Earth), Mars, Jupiter and Saturn. Forty-five minutes after sunset might be a good compromise. The fact that the sky is not completely dark at night is. The later in the evening you observe, the darker the sky will be, but the lower Mercury will be. Sky brightness refers to the visual perception of the sky and how it scatters and diffuses light. ![]() If our planet is similar to Earth, with a similar atmosphere, and is orbiting a star similar to the Sun, the daytime sky would be about 100,000 lux. The timing for observing the brightest objects in the night sky is determined by Mercury, which is setting in the west at dusk. ![]() So, although the night sky on our imaginary planet will be bright, and undoubtedly crowded with stars, it will be much fainter than Earth?s night sky during a full Moon. Surely everyone needs a break from politics. getty It’s been a week of anxiety, of doomscrolling and/or gleefreshing. By comparison, moonlight at a full Moon is about 0.2 lux, about eight times brighter. Dusk sees several bright planets and stars come out this week. So, on a planet in the core of a globular cluster, the starlight would be about 0.025 lux. If the universe is infinite and static, we must see stellar surface everywhere in the sky, so the night sky should be completely bright like the surface of the. Now, on Earth, on a clear night, starlight has a brightness of about 0.001 lux (a unit of ?illuminance?). Since the brightness of stars is inversely proportional to the square of distance, this means the brightness of stars in the night sky would be about 25 times what is seen from Earth. This also means that Venus remains visible after sunset for between 3.5 hours (at 30 degrees North) and 5.5 hours (at 60 degrees North). In the core of a typical cluster, the average distance between stars is about one light-year, compared to about five light-years in the solar neighbourhood. On the last morning of the year, a waning crescent Moon stands within 4° of Mars and Antares a beautiful sight in the predawn sky. This is because stars are packed together more tightly in the core of the cluster compared to the periphery. The view of the night sky from within a globular cluster would depend on your position within the cluster. How bright would the night sky be if Earth was in a globular star cluster?
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