The Earth's climate has undergone multiple changes, including ice ages and warm periods. These climate changes have had a profound impact on the evolution of life, leading to the extinction of species and the emergence of new ones. 结论Conclusion 地球的诞生是一个复杂而漫长的过程,涉及宇宙、物理...
Mars is the fourth planet from the sun and has a distinct rusty red appearance and two unusual moons. The Red Planet is a cold, desert world within oursolar system. It has a very thin atmosphere, but the dusty, lifeless (as far as we know it) planet is far from dull. Phenomenal dus...
We present a review of cosmological solutions in non-linear massive gravity, focusing on the stability of perturbations. Although homogeneous and isotropic solutions have been found, these are now known to suffer from either Higuchi ghost or a new non-linear ghost instability. We discuss two ...
As a tradeoff for the larger budget on Disney+, Doctor Who only has eight episodes this season. But former showrunner and arguably the best Doctor Who writer, Steven Moffat, also contributed an episode this season. And that’s always something to be excited about. Star Wars: Tales of the ...
A space elevator, also referred to as a space bridge, star ladder, and orbital lift, is a proposed type of planet-to-space transportation system, often depicted in science fiction. The main component would be a cable (also called a tether) anchored to th
Driven by the necessity to confirm the Dark Matter Hypothesis, one of the largest endeavours of modern science over the last 4 decades has been the direct search for dark matter particles. In spite of the efforts of thousands of scientists over the world, not a single particle of dark ...
The Weyl potential, which is the sum of the spatial and temporal distortions of the Universe’s geometry, provides a direct way of testing the theory of gravity and the validity of the ΛCDM (Lambda Cold Dark Matter) model. Here we present measurement of
Observational tests of quantum extension of Schwarzschild spacetime in loop quantumgravity with stars in the galactic centerJian-Ming Yan a,b , ∗ Cheng Liu a,b , † Tao Zhu a,b , ‡ Qiang Wu a,b , and Anzhong Wang ca Institute for Theoretical Physics & Cosmology, Zhejiang ...
The simulations are carried out with the general-relativistic code Koral [2], which has been adapted [3] tothe RN metric especially for this purpose.The RN naked singularity is taken here to represent awider class of horizonless objects in modif i ed theories ofgravity (in addition to ...
Mercury is the closest planet to the sun and has a thin atmosphere, no air pressure and an extremely high temperature. Take a look inside the planet.(Image credit: Karl Tate, SPACE.com) Oddly, due to Mercury's highly elliptical orbit and the 59 Earth-days or so it takes to rotate on...