JWST’s primary goals are studying the universe’s first galaxies, stellar/planetary formation, and exoplanet potential, crucially addressing the ‘Dark Ages’ by observing the earliest light (highly redshifted infrared) from the first stars and galaxies forming from primordial gas, revealing how these initial structures grew, evolved, and eventually led to the complex universe we see today, filling the gap between the Cosmic Microwave Background and Hubble’s view. Its infrared power pierces dust, allowing detailed views of these hidden, ancient cosmic nurseries and the building blocks of life. 

JWST’s Primary Science Goals

1. First Light & Reionization: Find the first galaxies formed after the Big Bang, studying the ‘Dark Ages’ (the period before the first stars) and Epoch of Reionization
2. Galaxy Assembly: Trace how galaxies evolve from their infant stages to present-day massive structures.
3. Star & Planet Formation: Observe star birth in stellar nurseries and the emergence of planetary systems.
4. Exoplanets & Origins of Life: Analyze atmospheres of exoplanets for signs of habitability and study our own Solar System. 

 Contribution to ‘Dark Ages’ & First Stars/Galaxies

• Looking Back in Time: JWST’s infrared sensitivity detects light from extremely distant objects, whose ultraviolet light has been stretched (redshifted) by the expanding universe into the infrared spectrum, bringing us light from over 13.5 billion years ago.
• Piercing Cosmic Dust: Its infrared vision cuts through thick dust clouds that obscure visible light, revealing the hidden environments where the first stars ignite and nascent galaxies begin to assemble.
• Unveiling Early Structures: By capturing light from these earliest epochs, JWST provides direct evidence of the first luminous sources (Population III stars) and how they coalesced into the first small proto-galaxies, transitioning the universe from neutral hydrogen to an ionized state.
• Understanding Galactic Seeds: Observing these primordial galaxies helps scientists understand how the building blocks of today’s large galaxies were first assembled and evolved, filling a crucial gap in cosmic history. 

 Way forward

The James Webb Space Telescope (JWST) is set to refine our understanding of cosmology by using high-precision observations of galaxy distribution and gravitational lensing effects to better study the properties of dark matter and dark energy, potentially helping to resolve current discrepancies in the universe’s expansion rate measurements. 

Additionally, JWST’s continued exoplanet observations, including detailed atmospheric analyses for biosignatures like water, methane, and potentially dimethyl sulfide (DMS), will be central to the ongoing search for life beyond Earth