Bism Allah Alrahman Alrahem
Are we living alone in this universe?!
The answer definitely is no! It is mentioned in the Holy Quran that we are not alone. In the second versus of chapter one of the Holy Quran (Surat Alhamd) after starting by the Name of Allah most Gracious most Merciful the verses says; Praise be to Allah, the Cherisher and Sustainer of the worlds! The worlds in Arabic Alalameen which means the world in which there are living been or life of intelligent creatures. The term world explained as the mankind, the Jins and the Angles, however, the wider meaning is more accurate than this. This means that there is another world that we unable to see at least now in which there are living and inelegant world.
The word Earth in English is taken from the Arabic word (Arth) ارض which means the planet which is suitable for life or the life is exist in it. The Earth or (Al Arth) was mentioned 425 times in the Holy Quran! The Holy Quran is the on-going miracle of Islam until the Day of Judgment. It contains so many scientific meaning and secrets some of them have not been discovered yet! It tells about the past before the existence, the present and the past beyond the Day of Judgment. It tells about the worlds, the positions of the stars, the creation of the Earth and how it became suitable for life and many other issues from the unseen to the part of atom up to the largest things in these worlds. There are many books written about the miracles of the Holy Quran including its scientific facts which only discovered recently such as the human embryology and formation. One of the most important miracles is the numbers of the words mentioned in the Holy Quran such as the Moon (Alqamar) mentioned 26 times, the Sun mentioned 30 times, the mountains 30 times, while the Earth mentioned 425 times! The question here is why Allah mentioned the word Earth 425 times?! This is not without meaning but we do not know exactly what? One possibility is that there are 425 Earth exist in this universe or universes! Whether or not all these earths got lives or some of them again the full knowledge is with Allah. On the other hand if we add the numbers of the 4+2+5 will give us total of 11. If we take of the outcome of subtracting 26 (the number the moon mentioned) from 30 (the number sun mentioned) which is 30 – 26 = 4; then we will have the number 7. Interestingly in another verse in the Holy Quran Allah mentioned that He created seven heavens and seven earths; (اللَّهُ الَّذِي خَلَقَ سَبْعَ سَمَاوَاتٍ وَمِنَ الْأَرْضِ مِثْلَهُنَّ يَتَنَزَّلُ الْأَمْرُ بَيْنَهُنَّ لِتَعْلَمُوا أَنَّ اللَّهَ عَلَىٰ كُلِّ شَيْءٍ قَدِيرٌ وَأَنَّ اللَّهَ قَدْ أَحَاطَ بِكُلِّ شَيْءٍ عِلْمًا) (Allah is He Who created seven Firmaments and of the earth a similar number. Through the midst of them (all) descends His Command: that ye may know that Allah has power over all things, and that Allah comprehends, all things in (His) Knowledge.) Holy Quran 12:65
The question therefore is do we have another 6 earths similar exactly to our own one? The exact answer is only with Allah but His Majesty our Lord ordered us to seek knowledge and to think about the universes as part of our worship and respect to Allah. In fact everything exist witness on His greatness including what we produce. Our productions like the spacecraft, the cars, the IT, the airplanes, the buildings, the everything had physical and other properties produced by God (Allah) and we are only putting these together. Even our putting them is by the brain and hands that Allah gave us; the best computer and the best tool!
Furthermore, the Holy Quran telling us that there are living creatures walking like us somewhere in the Heaven. It is mentioned as (Dabah) in Arabic which means creatures that walk on planet; as in this versus 29:22 (And among His Signs is the creation of the heavens and the earth, and the living creatures that He has scattered through them: and He has power to gather them together when He wills.)
Islam is your salvation in this life and in the hereafter so hurry to embrace Islam before you regret it when you have no second chance. Read the Holy Quran which is the words of Allah and the most positive book until The Day of Judgment.