Two great lights. God created on the first day light, which being moved from east to west, by its rising and setting made morning and evening. But on the fourth day he ordered and distributed this light, and made the sun, moon, and stars. The moon, though much less than the stars, is here called a great light, from its giving a far greater light to earth than any of them. (Challoner)

To rule and adorn, for nothing appears so glorious as the sun and moon. (Menochius)

Many have represented the stars, as well as the sun and moon, to be animated. Ecclesiastes xvi[i. 6?], speaking of the sun says, the spirit goeth forward surveying all places: and in Esdras[2 Esdras?] ix. 6, the Levites address God, Thou hast made heaven and all the host thereof; and thou givest life to all these things, and the host of heaven adoreth thee. St. Augustine Ench. and others, consider this question as not pertaining to faith. See Spencer in Origen, contra Cels. v. (Calmet)

Whether the stars be the suns of other worlds, and whether the moon, &c. be inhabited, philosophers dispute, without being able to come to any certain conclusion: for God has delivered the world to their consideration for dispute, so that man cannot find out the work which God hath made from the beginning to the end, Ecclesiastes iii. 11. If we must frequently confess our ignorance concerning the things which surround us, how shall we pretend to dive into the designs of God, or subject the mysteries of faith to our feeble reason? If we think the Scriptures really contradict the systems of philosophers, ought we to pay greater deference to the latter, than to the unerring word of God? But we must remember, that the sacred writings were given to instruct us in the way to heaven, and not to unfold to us the systems of natural history; and hence God generally addresses us in a manner best suited to our conceptions, and speaks of nature as it appears to the generality of mankind. At the same time, we may confidently assert, that the Scriptures never assert what is false. If we judge, with the vulgar, that the sun, moon, and stars are no larger than they appear to our naked eye, we shall still have sufficient reason to admire the works of God; but, if we are enabled to discover that the sun’s diameter, for example, is 763 thousand miles, and its distance from our earth about 95 million miles, and the fixed stars (as they are called, though probably all in motion) much more remote, what astonishment must fill our breast! Our understanding is bewildered in the unfathomable abyss, in the unbounded expanse, even of the visible creation.

Sirius, the nearest to us of all the fixed stars, is supposed to be 400,000 times the distance from the sun that our earth is, or 38 millions of millions of miles. Light, passing at the rate of twelve millions of miles every minute, would be nearly 3,000 years in coming to us from the remotest star in our stratum, beyond which are others immensely distant, which it would require about 40,000 years to reach, even with the same velocity. Who shall not then admire thy works and fear thee, O King of ages! (Walker.)

Geog. justly remarks, “we are lost in wonder when we attempt to comprehend either the vastness or minuteness of creation. Philosophers think it possible for the universe to be reduced to the smallest size, to an atom, merely by filling up the pores;” and the reason they allege is, “because we know not the real structure of bodies.” Shall any one then pretend to wisdom, and still call in question the mysteries of faith, transubstantiation, &c., when the most learned confess they cannot fully comprehend the nature even of a grain of sand? While on the one hand some assert, that all the world may be reduced to this compass; others say, a grain of sand may be divided in infinitum! (Haydock)