A planet is an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.The term planet is ancient, with ties to history, astrology, science, mythology, and religion. Five planets in the Solar System are visible to the naked eye.
We don't have any evidence to reject the possibility of life on other planets. We Muslims believe in the scientific evidence and encourage scientific research in every possible way and field. We also don't believe in imaginations and unsupported claims.
as salam alaikum
Yawm al-Qiyamah is not limited to planet earth and its effects as described in the Qur'an will be manifest in the whole universe and everything in it.
With prayers for your success.
Allah (SWT) Has the All and Absolute Knowledge and Wisdom, while we have very little knowledge if we have any. He knows the wisdom of creating whatever He created from the nucleus and atom to the galaxies. No doubt , there is a great wisdom which is known to Him, but not to us as our knowledge is very limited. We are in this universe like a small kid who sees huge library with thousands of books and wonders why these books were written.
Allah (SWT) knows what He created and we do not know. We believe that the creation and the order is in the hands of Allah.(Al-A'raaf, 54).
We can not reject the possibility of creatures in other planets as we have no evidence suggesting impossibility of creatures in any part of the universe. No doubt our knowledge as ordinary human beings is limited but the question itself (Whether there are aliens on other planets or not) does not have direct effect on our religious duties and our day to day life. That is why we need not to focus on such issues more that believing that Allah creates whatsoever He wants and selects.(Al-Qassass; 68).
This is a good question. As a wise scholar once said, it is likely that, in the Qur'an, Allah focuses on angels and jinn as the main sentient creatures other than humans since they are the ones we are most likely to have some sort of interaction with. However, this does not preclude the possibility (or, indeed, likelihood) of the creation of other beings.
It is narrated from Imam al-Baqir (A): ‘Perhaps you think that Allah has only created this single world, and you think that Allah has not created anyone other than yourselves! Nay by Allah, Allah has created a million worlds and a million Adams and you are in the latest of these worlds and of the latest Adams.' - Tawhid al-Saduq
There is a hadith from one of the Imams saying that Allah has a planet with a different length of day from Earth on which the inhabitants do not know that Allah is disobeyed anywhere. (I do not have the reference offhand, but perhaps someone can add it.)