1 citations · 1 across the 4 of their papers we have counts for
4 papers
Transfer of Life-Bearing Meteorites from Earth to Other Planets
Tetsuya Hara, Kazuma Takagi, Daigo Kajiura
The probability is investigated that the meteorites originating on Earth are transferred to other planets in our Solar System and to extra solar planets. We take the collisional Ch…
On the Formation Age of the First Planetary System
Tetsuya Hara, Shuhei Kunitomo, Masanobu Shigeyasu +1
Recently, it has been observed the extreme metal-poor stars in the Galactic halo, which must be formed just after Pop III objects. On the other hand, the first gas clouds of mass $…
Adopting the Uncertainty Principle for the Entropy Estimation of Black Holes, de Sitter Space and Rindler Space
Tetsuya Hara, Keita Sakai, Daigo Kajiura
By a simple physical consideration and uncertain principle, we derive that temperature is proportional to the surface gravity and entropy is proportional to the surface area of the…
On the Entropy Increase in the Black Hole Formation
Tetsuya Hara, Keita Sakai, Daigo Kajiura
The entropy increases enormously when a star collapses into a black hole. This entropy increase is interpreted as the decrease of the temperature due to the increase of the volume.…