A physicist on time, eternity and the life of faith

Time is familiar enough to organise a school day, catch a train in Sydney or plan a Sunday service, yet it becomes remarkably strange when examined through physics. We experience time as a steady movement from yesterday towards tomorrow. Physicists describe something more complex: time is woven together with space, affected by motion and gravity, and measured through physical processes.

For Christian faith, these insights do not turn eternity into a scientific object. They do, however, help us distinguish between time as creation and eternity as God’s mode of existence. A thoughtful dialogue between physics and Scripture can give Australian believers language for discussing science without treating scientific explanation as a rival to faith.

Time is more than a ticking clock

In everyday life, time appears universal. A meeting begins at 9 am in Melbourne, a livestream starts at the advertised hour in Perth, and families adjust their routines when daylight saving changes the clocks in some states but not others. These practical arrangements depend on shared measurements, not on time being a substance that flows identically everywhere.

Physics measures time through regular events: the oscillations of an atomic clock, the rotation of Earth, or the movement of a pendulum. Such measurements are extraordinarily reliable, yet they reveal that time is connected to the observer’s motion and position. The clock on a satellite does not keep exactly the same rate as a clock on Earth, which is why global positioning systems require corrections based on relativity.

This does not mean time is an illusion. It means our common experience is a limited view of a deeper physical structure. Time remains real within the universe, while its rate and relationship to space depend on conditions that ordinary human life rarely makes visible.

Relativity changes the picture

Einstein’s special theory of relativity showed that observers moving at different speeds can measure different intervals between events. At everyday speeds the effect is too small to notice, but it becomes significant as an object approaches the speed of light. A traveller moving extremely fast could experience less elapsed time than people who remain on Earth.

General relativity adds gravity to the picture. Clocks run more slowly in stronger gravitational fields, so time passes at a slightly different rate near a massive object than it does farther away. These effects matter in engineering as well as theory. Australian telecommunications, aviation and emergency services depend on timing systems whose accuracy reflects principles first developed in fundamental physics.

For a Christian audience, relativity offers a useful caution. Human intuitions about time are dependable for ordinary tasks, but they are not the final measure of reality. Scientific humility and theological humility meet here: the universe is intelligible, yet it exceeds the categories we form from daily experience.

The arrow of time and human memory

Relativity describes how time is measured, while thermodynamics helps explain why time seems to have a direction. Eggs break but do not spontaneously reassemble, smoke spreads through a room rather than gathering itself into a cigarette, and heat moves from warmer objects to cooler ones. This tendency is associated with increasing entropy, a measure of the number of possible microscopic arrangements in a system.

The arrow of time is also woven into human life. We remember the past, act in the present and anticipate the future. A FIFO worker returning to Perth after weeks at a remote mining site may feel that time has expanded and contracted at once: long shifts pass slowly, while family time disappears quickly. Physics gives an account of irreversible processes, but it does not fully explain the meaning we attach to them.

Biblical faith takes this human experience seriously. Scripture speaks of creation, history, promise, waiting, judgement and renewal. These themes assume that events matter and that time is not a meaningless sequence. The Christian story is historical in character, while it also points beyond the limits of the present age.

Eternity is not simply endless duration

People often imagine eternity as time continuing forever, like an infinite calendar stretching beyond the final page. That image can be helpful when speaking about unending life, but Christian theology has often used eternity in a richer sense. Eternity refers to God’s fullness of being and freedom from the limitations that govern created existence.

God is not a very old creature located somewhere outside the universe. The biblical claim that God created the heavens and the earth places time itself among the gifts of creation. God’s relationship to time therefore cannot be reduced to experiencing a longer version of human duration. When Scripture describes God as everlasting, it points to divine faithfulness, constancy and life without decay.

This distinction protects believers from forcing a scientific definition onto a theological reality. Physics can investigate time within the cosmos. It cannot place eternity inside a laboratory or calculate God’s lifespan. At the same time, theological language should not ignore what science has discovered about the universe’s history and structure.

Creation, time and the limits of explanation

Cosmology describes a universe with a finite observable history, shaped by expansion, matter, energy and physical laws. Questions about the early universe lead scientists to the edge of current knowledge, where established models become incomplete. A physicist may describe how the universe developed from an extremely hot, dense state without claiming to answer every question about why there is a universe at all.

This is where discussions can become confused. Some Christians fear that an old universe or cosmic evolution removes God, while some secular accounts treat scientific description as the only legitimate form of knowledge. A careful science and truth discussion recognises that empirical methods are powerful without turning them into a complete philosophy of life.

In Australia, students may encounter these tensions in a state school science classroom, at a university in Canberra or Melbourne, or through online debates that simplify complex positions. Churches can help by teaching young people the difference between a scientific model, a philosophical assumption and a theological conviction. That approach gives space for rigorous evidence and serious faith.

What eternity means for ordinary life

Eternity is not merely a topic for speculation about the distant future. It changes how Christians interpret present responsibilities. If creation is held by God and history is moving towards renewal, then work, relationships, justice and care for the natural world have lasting significance. The pressure of a crowded Brisbane commute or a demanding season in a regional town does not define the whole of human existence.

The New Testament presents eternal life as participation in a relationship with God that begins in the present and reaches its fulfilment beyond death. This is more substantial than escaping time. Christian hope anticipates resurrection, restored creation and the defeat of death. Eternity therefore includes continuity with God’s purposes, while also involving a transformation that cannot be produced by human progress.

Such hope can speak powerfully in a country familiar with both vast distances and sudden disruption. Drought, floods, bushfire seasons and isolation can expose the limits of human control. Faith in eternal life does not remove grief or excuse practical action, but it gives suffering a horizon wider than immediate circumstances.

Speaking about time with wisdom

A physicist explaining time should be clear about what physics can establish: clocks behave differently under changes in speed and gravity; space and time form a connected structure; thermodynamic processes create an apparent direction; and cosmology investigates the universe’s development. These findings invite wonder rather than requiring a simple conflict with biblical faith.

A pastor or teacher should be equally clear about what Scripture is doing. Biblical passages about God’s eternity, the beginning of creation and the promise of a new creation are not technical equations. They address God, purpose, human responsibility and hope. Reading them well requires attention to genre, context and the whole biblical narrative.

Dialogue becomes especially valuable when scientists, church leaders and educators listen before defending familiar slogans. An Australian youth group could discuss time dilation alongside Psalm 90, or consider the difference between chronological time and meaningful time after studying cosmology. The goal is not to make the Bible answer questions it was not written to answer, nor to make physics carry theological conclusions it cannot support.

When time is understood as a feature of creation and eternity as the fullness of God’s life, science and faith can meet without collapsing into each other. Explore reliable resources, encourage respectful conversations in churches and classrooms, and help young people pursue scientific questions with intellectual honesty and Christian hope.