On this day: First images from the James Webb Space Telescope

On 12 July 2022, NASA, in collaboration with the European Space Agency (ESA) and the Canadian Space Agency (CSA), released the first full-color images from the James Webb Space Telescope (JWST), an event hailed by scientists as the biggest advancement in astronomy since the Hubble Telescope.

This moment marked the culmination of decades of hard work, with the telescope costing over $10 billion and taking more than 20 years to build before its launch on 25 December 2021 from the Guiana Space Centre in French Guiana.

What did the world see in those images?

NASA unveiled five stunning images, including:

  • SMACS 0723 – the deepest infrared image of the universe: Revealed galaxies dating back over 13.1 billion light-years, just 600 million years after the Big Bang.
  • Carina Nebula: A breathtaking view of a star-forming region 7,600 light-years away, showcasing towering cosmic dust and gas clouds.
  • Southern Ring Nebula: An image of a dying star 2,500 light-years away.
  • Stephan’s Quintet: A cluster of five interacting galaxies 290 million light-years away.
  • WASP-96b – exoplanet spectrum: The first analysis of an exoplanet’s atmosphere, revealing water vapor.

How does Webb differ from Hubble?

The James Webb Telescope is not a replacement for Hubble but rather its successor. The key difference is that Webb observes the universe in infrared light, while Hubble captures visible and ultraviolet light. This allows Webb to peer through cosmic dust and detect the earliest galaxies formed after the Big Bang.

Webb orbits the Sun at a distance of 1.5 million kilometers from Earth at the L2 Lagrange point, maintaining a stable position relative to Earth and the Sun.

What has Webb achieved since then?

Since its first images in July 2022, the telescope has made groundbreaking discoveries:

  • Identified some of the earliest galaxies, dating back to just 300 million years after the Big Bang.
  • Analyzed exoplanet atmospheres, detecting carbon dioxide and methane.
  • Captured unprecedented details of Jupiter and Saturn.
  • Studied active black holes in distant galaxies.

Frequently Asked Questions

Q: How much did the James Webb Telescope cost?
A: The project cost approximately $10 billion USD.

Q: Is Webb better than Hubble?
A: Each telescope has its strengths. Webb excels in infrared, while Hubble is superior in visible light. They complement each other.

Q: How long will Webb operate?
A: It is expected to last 20 years or more due to precise launch and fuel efficiency.