The tail of the comet is due to

$A$ bright star is indicated to have a brightness magnitude of $-5$ compared to a star of brightness zero magnitude. It means that this star,compared to the reference star of zero brightness,is:

Which one of the following planets has the longest day?

Which of the following is not true about the total lunar eclipse?

$A$ total solar eclipse is observed from the Earth. At the same time,an observer on the Moon views the Earth. She is most likely to see ($E$ denotes the Earth):

Albedo is maximum for