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🚀 Astronomy frontiers — 2026

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What astronomers are working on now. Each card states the open question, the evidence so far and the methods used — not results that have not happened yet.

  • Dark matter & dark energy

    Open question: What are the invisible matter (≈ 27%) and dark energy (≈ 68%) that make up most of the Universe?

    Where it stands: No dark-matter particle has been detected yet. In 2024–25 the DESI survey hinted that dark energy may be weakening over time — an exciting result still being tested.

    Builds on: Galaxy rotation curves (Rubin, 1970s) and the 1998 accelerating Universe.

    Galaxy surveys (DESI, Euclid)Underground detectors

  • Life beyond Earth

    Open question: Is there life on Mars, under the icy moons Europa and Enceladus, or on planets around other stars?

    Where it stands: Perseverance is collecting rock samples on Mars; Europa Clipper is on its way (arriving 2030); JWST measures exoplanet atmospheres, but no confirmed sign of life exists.

    Builds on: Exoplanet discoveries since 1995.

    Sample returnSpectroscopyOcean-world missions

  • The Hubble tension

    Open question: Why do two ways of measuring how fast the Universe expands disagree (≈ 67 vs ≈ 73 km/s per megaparsec)?

    Where it stands: JWST has confirmed the nearby measurements; the gap remains. It may point to new physics or to hidden errors.

    Builds on: Leavitt's Cepheid ruler and Hubble's law.

    Cepheids & supernovaeCosmic microwave background

  • The first galaxies

    Open question: How did the first stars and galaxies form so quickly after the Big Bang?

    Where it stands: JWST has found galaxies only ≈ 300 million years after the Big Bang that are brighter than many models expected.

    Builds on: Hubble deep fields and Big Bang cosmology.

    Deep infrared imagingSpectroscopy

  • Planetary defence

    Open question: Can we spot and deflect asteroids that might hit Earth?

    Where it stands: NASA's DART spacecraft changed the orbit of the moonlet Dimorphos in 2022 — the first test. NEO Surveyor (launch planned 2027) will hunt for hazardous asteroids.

    Builds on: Orbital mechanics; the dinosaur-killing impact.

    Sky surveysKinetic impactors

  • The Vera Rubin Observatory

    Open question: What will a 10-year movie of the whole southern sky reveal?

    Where it stands: First images released in 2025; the Legacy Survey of Space and Time will catalogue billions of galaxies and millions of asteroids and changing objects.

    Builds on: Two centuries of sky surveys.

    Wide-field surveyBig data & AI