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One of the issues emphasized in Islam, and the Quran is contemplation and reflection. Human beings are created to worship Allah almighty, yet praising Him is not restricted to religious rituals and practices. According to Imam Hasan Al-Askari (عليه السلام), worship is contemplating on Allah Almighty's affairs [1]. It means being mindful of the signs of Allah Almighty, pondering about them, and realizing how powerful He is. Some of these signs are mentioned in the Quran (2:164), of which some have been discovered as scientific facts many centuries after the revelation of the Quran. Here, we review some of these facts. 1. Adornment of the Lowest Sky: Stars In Surah Saffat, it is stated that: "Indeed We have adorned the lowest heaven with the finery of the stars." (37:6). The lowest heaven means the nearest sky that we observe from the earth. The Quran introduced this fact, while in that era, the accepted hypothesis was that the fixed stars existed only in the highest sky (the 8th sky, according to Claudius Ptolemy's hypothesis). Nowadays, it is also known that as light passes through pockets of the earth's atmosphere, it is affected by winds in the atmosphere and by areas with different temperatures and densities. It is, therefore, diffracted (bounced around), causing a quick apparent dimming and brightening when looking from the ground. This phenomenon perfectly fits the term "lower heaven," while out of earth's atmosphere, it doesn't happen. 2. Every Star Moves in its Proper Path In Surah Waqi'ah, it is said that: "So I swear by the places where the stars set! And indeed, it is a great oath, should you know." (56:75-76). Today, we know that each star holds a proper position in the sky, and its path and orbit depends on gravity. The velocity of each is also specific. Although exact calculation about the stars too far away is not possible, the measurements done for the stars of the Milky Way Galaxy confirms these facts. 3. Sun's Orbit according to the Quran In 1512 AD, the astronomer Nicholas Copernicus put forth the theory that the sun is at rest near the center of the universe and that the earth, spinning on its axis once daily, revolves annually around the Sun [2]. This belief that the sun is motionless was not acknowledged by astronomers until the 20th century. That's while in the Quran, it is mentioned that: "And the sun runs on to its place of rest. That is the ordaining of the All-mighty, the All-knowing." (36:38). This Quranic account of the sun's motion is consistent with modern Astronomy because the mentioned Copernicus's theory is not valid anymore. Instead, it has been well-established that the sun is not stationary, but is moving in its orbit around the center of Milky Way Galaxy. 4. Universal Gravitation Today, it is known that the gravitational forces hold the celestial bodies apart from each other, hence, preventing their collision [3]. This fact was explicitly stated in the Quran: "It is Allah who raised the heavens without any pillars that you see" (13:2), and: "He created the heavens without any pillars that you may see" (31:10). According to these verses, there exist invisible supports that raise the heavens. These supports are now referred to as the gravitational and other unseen forces in the universe [3]. Some of the astronomical facts discussed in the Quran and were discovered later on by scientists were described above. There remain still other points presented in the second part of this topic. Follow us to find out more.

In the first part of this article on the scientific facts in the Quran, some astronomical facts mentioned were discussed. Here, we review some interesting facts about nature, including some points about mountains, the origin of life, the position of the sky and the seas merging together. 5. Mountains with Deep Roots under the Ground The Quran has used the word stakes to describe mountains: “It is He who has spread out the earth and set in it firm mountains” (13:3), “Did We not make the earth a resting place? and the mountains stakes?” (78:6-7). It means that mountains have deep roots under the ground surface. Mountains do have deep roots, and the word stakes is an accurate description for them. This fact was discovered only in the latter half of the 19th century. The presence of the mountains on the ground also helps to stabilize the crust of the earth [4]. They also hinder the earth-shaking. “He cast in the earth firm mountains lest it should shake with you” (16:15). This is known today under the theory of plate tectonics since the late 1960s [1]. 6. The Origin of Life according to the Quran Life of a human being starts in water. From conception to birth, a fetus is protected and cushioned in a sack of water. A human body needs water in all its cells, organs, and tissues to help regulate its temperature and maintain other bodily functions. Plants also need enough hydration to perform photosynthesis, while animals consume water to carry out cell activity. Overall, water is an essential element for all living beings on earth. This fact was discovered only after the invention of the microscope. Now we know that all living things are made up of cells which are mostly made up of water. This fact has already been stated in the Quran: “We made every living thing out of water? Will they not then have faith?” (21:30). 7. The Sky as the Protector of the Earth The sky plays several essential roles as the protector of the earth, such as filtering out the lethal rays of the sun. If there were no sky, the sun’s radiations would have killed off all life on earth. The sky also acts as a blanket around the earth, which protects the living things from freezing out by the cold just above the sky that is approximately -270°C. The greenhouse effect is another role that the sky plays. By warming the surface of the earth by means of heat retention, the sky reduces temperature extremes between day and night [2]. These protective roles of the sky were discovered by scientists in the 20th century. The Quran has mentioned this role of the sky as: “We made the sky a preserved roof and yet they are disregardful of its signs.” (21:32). 8. Where the Seas Meet It has been discovered by the scientists that there is a barrier between the two different seas that meet. Hence, each of the seas has its own temperature, salinity, and density, like the Mediterranean Sea and Atlantic Ocean water. Despite large waves, strong currents, and tides in these seas, they neither mix nor do they transgress this barrier [3]. This phenomenon has been mentioned in the Quran as: “He merged the two seas, meeting each other. There is a barrier between them which they do not overstep.” (55:19-20). There is also a case where fresh (sweet) and sal[Edited Out]er meet. Here, the Quran talks about the existence of a forbidding partition along with the barrier: “It is He who merged the two seas: this one sweet and agreeable, and that one briny and bitter, and between the two He set a barrier and a forbidding hindrance.” (25:53). Modern science has discovered that in estuaries, where fresh and sal[Edited Out]er meet, there is a marked density discontinuity that separates the two layers. The salinity of this zone of separation (partition) is different from that of freshwater and that of sal[Edited Out]er. There is, therefore, the division of water in estuaries into three parts: freshwater, sal[Edited Out]er, and the partition [3]. Follow us on the last part of this topic to find out what the Quran has revealed about human embryonic development, clouds, and deep seas, and the creation of everything in pairs.