A specific modification of Newtonian dynamics known as MOND has been shown to reproduce the dynamics of most astrophysical systems at different scales without invoking non-baryonic dark matter (DM). There is, however, a long-standing unsolved problem when MOND is applied to rich clusters of galaxies in the form of a deficit (by a factor around two)

We present the discovery of two small planets transiting HD 93963A (TOI-1797), a GOV star (M * = 1.109 ± 0.043M ⊙, R * = 1.043 ± 0.009 R ⊙) in a visual binary system. We combined TESS and CHEOPS space-borne photometry with MuSCAT 2 ground-based photometry, `Alopeke and PHARO high-resolution imaging, TRES and FIES reconnaissance spectroscopy, and

Active galaxies are these showing strong emission coming from their nuclei. In the case of normal galaxies the nuclear emission has a stellar origin, but in active galactic nuclei (AGN) the emission is produced by accretion of matter into a super-massive black hole (SMBH). Although only a small percentage of galaxies in the nearby Universe

The last evolutionary stage of about 97 per cent of the stars in the Milky Way is the white dwarf phase: a remnant stellar core sustained by electron degeneracy pressure with a typical mass of 0.6 solar masses and a radius such as the Earth's. The study of white dwarfs is not only genuinely interesting due to them being the remnants of the majority

Desde su descubrimiento en 1912 por Victor Hess, los rayos cósmicos han proporcionado información clave sobre el origen, aceleración y propagación de partículas a través de nuestra galaxia. Los experimentos de rayos cósmicos han proporcionado información importante para la física de partículas. En física solar, los rayos cósmicos contribuyen a la

A pesar de que actualmente se conocen alrededor de 5000 planetas, solo unos pocos (~1%) de ellos se han descubierto orbitando alrededor de estrellas con una edad conocida menor de ~1 Ga. Por lo tanto, carecemos de la información necesaria para imponer restricciones sobre los mecanismos que regulan la formación y evolución de sistemas planetarios y