What is the firmament?
Question 60095
The word “firmament” appears in the King James Version of Genesis 1 and has generated considerable discussion ever since, particularly as critics of the biblical account have claimed it reveals a primitive, pre-scientific cosmology in which the ancient Israelites believed the sky was a solid dome. That claim is worth examining on its own terms, because the actual Hebrew evidence is significantly more nuanced than the popular version of the argument allows.
The Hebrew Word and What It Means
The word translated “firmament” in the KJV and “expanse” in the ESV and most modern versions is the Hebrew raqia (רָקִיעַ). It derives from the verb raqa, which means to beat out, spread out, or hammer flat, in the way a metalsmith would hammer a sheet of metal to extend it across a broader surface. The English Standard Version’s choice of “expanse” captures this sense: something spread out across a wide area. The word describes what has been stretched out, extended, spread broadly.
God’s action in Genesis 1:6–7 is to make the expanse in the midst of the waters, separating the waters below it from the waters above it. This expanse is then named “heaven” or “sky” (shamayim) in verse 8. It is the space in which birds fly (Genesis 1:20) and in which the sun, moon, and stars are set (Genesis 1:14–17). The expanse, in other words, encompasses both the atmospheric zone inhabited by creatures and the vast space in which the heavenly bodies travel. It is the created space between the earth and whatever lies beyond it.
Is the Firmament a Solid Dome?
Critics frequently cite the raqia as evidence that the biblical authors shared the ancient Near Eastern cosmological belief in a solid celestial dome holding back a cosmic ocean above the earth. On this reading, the “waters above the firmament” of Genesis 1:7 and Psalm 148:4 refer to a literal ocean suspended above a rigid sky, and the Hebrew text betrays the same cosmological assumptions found in Babylonian and Egyptian mythology.
This argument, while popular in certain academic circles, involves importing an interpretive framework from surrounding ancient cultures and reading it back into the Hebrew text rather than allowing the text to speak on its own terms. The use of raqa and related terms in Scripture does not consistently imply rigidity. Isaiah 42:5 uses the same verb (raqa) to describe God stretching out the earth, and Isaiah 44:24 speaks of God who “stretches out the heavens like a curtain.” A curtain is not solid. Psalm 104:2 uses similar imagery: God stretches out the heavens like a tent. The consistent picture in the Old Testament of the sky as something stretched out or spread out does not require the image of a rigid dome. It requires the image of an expanse, which is precisely what the ESV renders.
The ancient Near Eastern parallels are real but their significance is contested. The fact that other cultures in the ancient world had cosmological beliefs about a solid sky does not require that the Hebrew text shared those beliefs, any more than the fact that other cultures had flood accounts requires that the Genesis flood narrative is merely borrowed mythology. Israel’s theology consistently distinguishes itself from its surrounding context in fundamental ways. The creation account of Genesis 1 does not share the polytheism, conflict mythology, or cosmological apparatus of the Enuma Elish. There is no good reason to assume it silently borrowed the solid-dome cosmology either.
The Waters Above the Expanse
Genesis 1:7 describes God separating the waters below the expanse from the waters above the expanse. Psalm 148:4 addresses “you waters above the heavens.” The identity of these “waters above” is a question that has engaged both ancient and modern commentators. Several readings deserve consideration.
The most straightforward reading is that the waters above the expanse refer to clouds and the water cycle. The sky holds water that descends as rain, and this is what lies “above” the atmospheric expanse from the perspective of the earth below. Proverbs 8:28 refers to God establishing the clouds above, and the natural water cycle is well within the scope of biblical imagery about the heavens.
A more developed proposal, associated particularly with Henry Morris and John Whitcomb in their influential work The Genesis Flood, suggests a pre-flood water vapour canopy encircling the earth above the atmosphere. On this view, the “windows of heaven” opened in Genesis 7:11 at the beginning of the flood correspond to the collapse of this canopy, which contributed the water for the flood’s precipitation. The canopy, while it existed, would have created greenhouse-like conditions: more uniform temperatures globally, higher atmospheric pressure, increased filtration of cosmic radiation. This would provide a physical explanation for the extraordinary longevity of the pre-flood patriarchs recorded in Genesis 5, as reduced radiation exposure and different atmospheric conditions could plausibly have affected human physiology. The gradual reduction in lifespan after the flood, following the canopy’s collapse, fits this framework.
This canopy theory is a scientific hypothesis rather than an explicit biblical teaching, and it has attracted both support and critique within creation science. The biblical text does not describe the canopy in physical detail; it simply distinguishes the waters above from the waters below, with the expanse between them. The canopy model represents one coherent attempt to understand what that distinction might mean in physical terms, and it has the merit of accounting for data points in the text, such as the changed conditions after the flood, that otherwise require separate explanation.
What the Expanse Tells Us About Creation
Whatever the precise physical referent of the “waters above,” the theological significance of the expanse in Genesis 1 is clear. God created space. He ordered what was formless and void by introducing structure, separation, and definition. The expanse is not an accident of nature but a divine act of creation on the second day, bringing into being the arena in which all subsequent created life would exist. The sun, moon, and stars are placed in this expanse not as independent deities (as in surrounding ancient cultures) but as functional lights serving the earth and marking times and seasons by God’s design. The heavens declare the glory of God (Psalm 19:1) precisely because they are created things, stretching across the expanse He made and bearing witness to the power and wisdom of the One who made them.
So, now what?
The “firmament” or “expanse” of Genesis 1 refers to the created space between the earth and what lies beyond it: the sky in which birds fly, the space in which the sun, moon, and stars move, and the boundary separating what is below from the waters above. The Hebrew word does not require a solid dome, and the claim that it reveals a primitive cosmology depends more on importing ancient Near Eastern mythology into the text than on careful reading of the text itself. What the expanse does reveal is a God who created with intention, structure, and purpose, who separated, ordered, and filled what was formless, and who placed the heavenly lights in their vast space to serve the earth He would fill with life. The sky above us is not an accident. It is the work of the same hands that formed us.
“And God said, ‘Let there be an expanse in the midst of the waters, and let it separate the waters from the waters.'” Genesis 1:6
