Do you know why Venus is so bright? Watch till end to know about it. Venus is the closest planet to Earth. But that's not the only reason why it's so bright, during the window when Venus can be seen from the Earth, which is within a few hours after sunset or before sunrise. It is the brightest object in the sky other than the moon. This intense brightness is because it's thick atmosphere, which reflects more than 70% of the sunlight. That reaches back into space. Venus's massive atmosphere is 90 times larger than that of Earth's, which has mostly carbon dioxide with some nitrogen, and trace amount of water vapor. Venus's atmosphere also has a thick layer of sulfuric acid clouds, which gives its distinct yellowish appearance. Thanks for watching.