It's the night before Christmas. That is the night when Santa Claus collects final reports from his assistants. And makes decisions about what kind of gifts people deserve. Good people get good gifts that make them happy. Bad people get bad gifts that make them unhappy. So what gift will you want or what gift will you give to your best friend or your worst enemy? The village is waiting... Here is no snow. So we might want a white Christmas and snow back. The thing is that we wait for gifts and Santa Claus. But the fact is that. Humans are the things that make Christmas. We are the thing that makes feelings and memories. So what can we give to everybody? We can say that the gift that we can give is knowledge. We can develop technology that makes Earth a better place. Earth is warming. And we can make things that slow that warming. But somehow. Even if we know. That global temperature rises. We cannot make any things that we can slow the temperature rise. The night before Chri...
In theory, the ultimate big stars can be quasi-stars. The quasi star is the star there is a black hole inside it. And in some models, those quasi-stars can be invisible. The high energy radiation from black holes can turn a star so hot that it starts to send ultraviolet or some higher energy radiation. But can the energy production continue in the black hole? That thing means that the black hole would be so high-energy object. That it sends. Only gravitational, gamma, and X-ray radiations. So could some black holes be so high energy stars that they send only X- and gamma radiation, or is it possible that some stars can send only gravitational radiation? We should ask: are some black holes stars? The black hole as the star is based on the theorem that there can be so high energy stars that they send only X- or gamma-rays. The thing can be possible. If there are some kind of very high-energy reactions in the black hole or the "black star". But what those reactions can be?...