#Hubble Space Telescope — bridge42worlds

History

The idea of a space telescope was voiced as early as the 1940s, but Hubble was launched in 1990 on the shuttle Discovery. Named after Edwin Hubble, who proved the expansion of the Universe. Right after launch, it was discovered that the primary mirror had a defect, and the first repair mission in 1993 installed corrective optics, 'putting glasses' on the telescope.

History

The Large Space Telescope project was developed since the 1960s. The launch was repeatedly postponed, including due to the Challenger shuttle disaster in 1986. On April 24, 1990, Discovery placed the telescope into orbit, but it was discovered that the primary mirror suffered from spherical aberration — a shape error. The first repair mission (STS-61, 1993) installed the COSTAR unit with tiny corrective mirrors and replaced the camera, revitalizing the project. Subsequent missions added ever more sophisticated instruments: the ACS camera (2002), the COS spectrograph and WFC3 camera (2009). From the outset, the scientific inspiration behind the project was Lyman Spitzer, and the name of Edwin Hubble recalls his epoch-making discovery of the expansion of the Universe. It was with Hubble that Adam Riess and his colleagues discovered that this expansion is accelerating.

How it works

HST uses a Ritchey–Chrétien optical system with an effective focal length of 57.6 m (f/24). Light is collected by the primary mirror, reflected to the secondary hyperbolic mirror, and then through the central hole in the primary projected onto the focal plane, where instruments are located. Cameras use CCD sensors; spectrographs use diffraction gratings. Fine pointing is achieved by the Fine Guidance Sensors, which use 14th-magnitude stars. The onboard computer executes observation scripts; data transmission occurs via radio link through TDRS satellites.

Open problems & fun facts

Gradual degradation of gyroscopes limits maneuverability — HST now operates in single-gyro mode.; The end of servicing missions due to the cessation of shuttle flights means no repair or upgrade capability.; HST does not cover the mid-infrared range, so it cannot see very distant (redshift > 10) galaxies, limiting the study of the early Universe.

💡 The initial 'soapy blur' on Hubble images spurred the development of blind deconvolution methods. These algorithms restore the true image without precise knowledge of the distortion shape and are now used in microscopy to obtain clear images of cells.

Cosmic Drops: How Gravity Revealed Four New Cold Giants

Astronomers have reported the discovery of four cold giant planets around low-mass stars. They were betrayed by brief anomalies in the light curves — as if a water droplet on a windowpane momentarily focused distant light. All planets lie beyond the snow line, up to 6 astronomical units from their s

arXiv:2607.04594v1 · 2026-07-06

Cosmic Palimpsest: Gravitational Waves Reveal the Story of Ancestor Black Holes

Analysis of two recent events from the GWTC-5.0 catalog showed that, with a probability 6–8 times higher than alternative explanations, the primary black holes in these systems were born in previous collisions. A Bayesian comparison of hypotheses favored the “2G+1G” scenario—a merger of a descendant

arXiv:2607.04663v1 · 2026-07-06

Symphony of Dark Energy: From Heavy Adagio to Explosive Allegro

In the standard cosmological model, two epochs of the Universe speak different languages: the temperature of the cosmic microwave background demands one expansion rate, while supernova explosions demand another. The discrepancy has surpassed the five-sigma threshold, becoming a true crisis. The ECDM

arXiv:2607.05044v1 · 2026-07-06

Waltz of Invisible Moons: The First Spectroscopic Find

Astronomers have discovered planetary-mass moons around a brown dwarf for the first time using high-precision spectroscopy. Observations with the VLT and the CRIRES+ spectrograph revealed periodic wobbles in the radial velocity of the starlike object CD-35 2722 B, hinting at at least one moon about

arXiv:2607.05193v1 · 2026-07-06

The Ocean of Spacetime: The Hum of Black Holes and the Precision of Simulations

Recently, pulsar timing arrays have for the first time picked up the low-frequency hum of gravitational waves — a cosmic analog of the noise from distant storms in the ocean of spacetime. Comparing NANOGrav data with the Fable simulation showed that the predicted signal from supermassive black hole

arXiv:2607.05208v1 · 2026-07-06

Catching the Neutrino Wind: Why the Faintest Breeze in the Universe Demands the Impossible

The cosmic neutrino background is a ghostly echo of the Big Bang, billions of neutrinos permeating every cubic centimeter of space. Scientists have been hunting for its direct detection for years, but new work shows that measuring its anisotropy—the 'neutrino wind'—is a task orders of magnitude hard

arXiv:2607.05221v1 · 2026-07-06

The Pulse of a Black Hole: Birth of a Jet in X-ray Echo

Years of observations with XMM-Newton, Swift, and VLA showed how the changing-look active galaxy 1ES 1927+654 underwent a dramatic transition from a wind regime to a jet. X-ray spectra revealed oxygen emission lines and a broad iron line, while ionized absorption faded. Synchronously, radio emission

arXiv:2607.05246v1 · 2026-07-06

Symphony of Shadows: Neutrino Telescopes Catch the Whisper of Dark Matter

Using 13 years of data from the ANTARES telescope, scientists have set stringent limits on the interaction of dark matter with ordinary matter across mass scales from keV to GeV. Collisions of cosmic rays with dark matter particles in the Galactic Ridge produce neutrinos that are detected by deep-se

arXiv:2607.05335v1 · 2026-07-06

The Forge of Black Holes: Stellar Mergers as a Source of Spin

In dense globular clusters, frequent collisions of massive stars lead to the formation of rapidly rotating blue supergiants. Simulations show that when the mass ratio of the components exceeds 0.3, the merger product does not expand into a red supergiant and retains its angular momentum. The collaps

arXiv:2607.05495v1 · 2026-07-06

The Mystery of Fragile Satellites: Dark Matter Under Tidal Assault

Elena Asencio and her colleagues showed that, contrary to standard cosmology, the Milky Way’s classical satellites suffer strong tidal deformations. In MOND (modified Newtonian dynamics) these disruptions are natural, while cold dark matter predicts they should be almost completely shielded by massi

arXiv:2607.05502v1 · 2026-07-06

Globular Clusters: A Palimpsest of Ancient Gas Clouds

For decades astronomers puzzled over mysterious anti-correlations of light elements in globular clusters. New research based on high-resolution cosmological simulations shows: the chemical anomalies could have arisen long before the birth of the cluster's first stars—in giant gas clouds. This scenar

arXiv:2607.05509v1 · 2026-07-06

Icy Whisper: O-PTIR Captures Amino Acids Beyond Diffraction

The O-PTIR method shatters the diffraction barrier: infrared heating translates into thermal expansion, read by a visible laser. This enables submicron resolution and sensitivity down to 0.2 µM. Crucially, organics distort the ice's own absorption bands, creating a subtle yet informative spectral fo

arXiv:2607.05629v1 · 2026-07-06

Hubble Space Telescope

History

How it works

History

How it works

History

How it works

Open problems & fun facts

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