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Sequences of high-resolution radio images and optical polarization measurements of the blazar BL Lacertae are reported. The data reveal a bright feature in the jet that causes a double flare of radiation from optical frequencies to TeV γ-ray energies. It is concluded that the event starts in a region with a helical magnetic field as envisaged by the theories.

New ultra-high-resolution images of the radio galaxy M87 show the origin of a jet very close to the galaxy's black hole, revealing that jets start as broad flows before straightening into nearly cylindrical beams. See Letter p.185

IXPE has revealed how the spin of the accreting neutron star Hercules X-1 changes in three dimensions. The spin axis of the star moves both through the star and across the sky, hinting that the crust of the star is asymmetric by almost one part in a million.

Spatially resolved images of M87 obtained at a wavelength of 3.5 mm in 2018 show a ring-like accretion structure, the inner (outer) edge of which connects the black hole (jet).

The accretion geometry of X-ray binary Cygnus X-3 is determined here from IXPE observations. X-ray polarization reveals a narrow funnel with reflecting walls, which focuses emission, making Cyg X-3 appear as an ultraluminous X-ray source.

A study reports the measurement of the polarization degree and angle of X-rays from Sagittarius A^* reflected off a nearby cloud, indicating an X-ray flare about 200 years ago.

X-ray polarimetry observations with the Imaging X-ray Polarimetry Explorer constrain the accretion geometry in an X-ray pulsar and provide evidence for a misalignment of the spin, magnetic and orbital axes in Her X-1.

Space interferometry reveals the hidden and filamentary internal structure of the relativistic jet in 3C 279 at microarcsecond angular resolution. These details challenge previous assumptions on the morphology and radio variability of blazars.

X-ray polarization measurements of the Crab nebula and pulsar by the IXPE satellite reveal a global toroidal magnetic field with large variations in local polarization, suggesting a more complex turbulence distribution than anticipated.

Polarization can exceed 60% at the leading edge of the inner part of the Vela pulsar wind nebula; in contrast with the case of the supernova remnant, the electrons in the pulsar wind nebula are accelerated with little or no turbulence in a highly uniform magnetic field.

In June 2022, the IXPE satellite observed a shock passing through the jet of active galaxy Markarian 421. The rotation of the X-ray-polarized radiation over a 5-day period revealed that the jet contains a helical magnetic field.

Polarization measurements are reported for the blazar Mk501, revealing a degree of X-ray polarization that is more than twice the optical value and supporting the shock-accelerated energy-stratified electron population scenario.

The millimetre image of the Centaurus A nucleus by the Event Horizon Telescope reveals a highly collimated, asymmetrically edge-brightened jet. The source’s event horizon shadow should be visible at terahertz frequencies, consistent with the universal scale invariance of black holes.