The bright supergiant, Betelgeuse (Alpha Orionis, HD 39801), underwent a historic optical dimming during 2020 January 27 $-$ February 13. Many imaging and spectroscopic observations across the electromagnetic spectrum were obtained prior to, during, subsequent to this event. These of reveal that substantial surface mass ejection (SME) occurred moved out through extended atmosphere supergiant. A...

The paper shows that the commonly used Friedmann-Lemaitre-Robertson-Walker (FLRW) metric describing expanding Universe must be modified to properly predict cosmological redshift. It is proved change in frequency of redshifted photons always connected with time dilation, similarly as for gravitational Therefore, cosmic runs differently at high redshifts than present. Consequently, identified con...

It is known that magnetic fields exist near black holes and photons can go around due to strong gravity. Utilizing these facts, we probe hypothetical pseudoscalar particles, so-called axions. In fact, be converted into axions when they propagate in a field. The conversion of such leads dimming the photon ring hole shadow. We show occur efficiently for supermassive holes. Remarkably, it turns ou...