D&C 88

As scientists today make all sorts of claims concerning truth, the Lord explains -

"He that ascended up on high, as also he descended below all things, in that he comprehended all things, that he might be in all and through all things, the light of truth;
7 Which truth shineth.  This is the light of Christ.  As also he is in the sun, and the light of the sun, and the power thereof by which it was made.
8 As also he is in the moon, and is the light of the moon, and the power thereof by which it was made;
9 As also the light of the stars, and the power thereof by which they were made;
10 And the earth also, and the power thereof, even the earth upon which you stand.
11 And the light which shineth, which giveth you light, is through him who enlighteneth your eyes, which is the same light that quickeneth your understandings;
12 Which light proceedeth forth from the presence of God to fill the immensity of space—
13 The light which is in all things, which giveth life to all things, which is the law by which all things are governed, even the power of God who sitteth upon his throne, who is in the bosom of eternity, who is in the midst of all things."  (Doctrine and Covenants | Section 88:6 - 13)

In other words, He is the one in control of all things.  Joseph Fielding Smith taught that the -

“Light of Christ is not a personage. It has no body. I do not know what it is as far as substance is concerned; but it fills the immensity of space and emanates from God. It is the light by which the worlds are controlled, by which they are made. It is the light of the sun and all other bodies. It is the light which gives life to vegetation. It quickens the understanding of men, and has these various functions as set forth in these verses.

“It is: ‘The light which is in all things, which giveth life to all things, which is the law by which all things are governed, even the power of God who sitteth upon his throne, who is in the bosom of eternity, who is in the midst of all things.’

“This is our explanation in regard to the Spirit of Christ, or Light of Truth, which every man receives and is guided by. Unless a man had the blessings that come from this Spirit, his mind would not be quickened; there would be no vegetation grown; the worlds would not stay in their orbits; because it is through this Spirit of Truth, this Light of Truth, according to this revelation, that all these things are done.

“The Lord has given to ‘every man that cometh into the world,’ the guidance of the Light of Truth, or Spirit of Jesus Christ, and if a man will hearken to this Spirit he will be led to the truth and will recognize it and will accept it when he hears it.” (Doctrines of Salvation, Vol. 1, pages 52–53.)