Αποτελέσματα Αναζήτησης
Why do stars only come out at night? The stars are in the sky both day and night. During the day our star, the Sun, makes our sky so bright that we cannot see the much dimmer stars. At night, when the sky is dark, the light of the stars can be seen.
Why is the sky dark at night? You might think the answer is obvious, the sun isn't up. But the only reason the sky looks blue during the day is that sunlight scatters off of the atmosphere. If we didn't have an atmosphere, like on the moon, the sky would always be dark even when the sun is shining. So let's rephrase the question. Why is space dark?
The dark sky paradox, also known as Olbers’ Paradox, explains why, despite the infinite number of stars in the Universe, the sky at night appears black.
In this lesson, students use a model to investigate why the stars are visible at night but disappear when the Sun comes out during the day. In the activity, Star Projector, students use paper cups to project stars onto a sky picture, and observe what happens to these stars when a flashlight acts as a model of the Sun.
19 Οκτ 2023 · Even though our night sky isn’t completely filled with stars, we live in a very special time in the universe’s life, when we’re lucky enough to enjoy a rich and complex night sky, filled ...
Instead the night sky is practically black. So where does the argument go wrong? The German astronomer Johannes Kepler first posed this problem in 1610. He also suggested a solution: the universe of stars, he believed, extends only out to a finite distance; once your line of sight passes that boundary, it encounters only empty space.
18 Ιουν 2023 · The darkness of the night sky seems so obvious as to need no explanation – yet it has intrigued and baffled scientists for centuries.
