5five5 topic

1. Black holes are regions of space that has so much mass concentrated in it that there is no way for a nearby object to escape its gravitational pull. There size can vary in size, but typical one is 10 times the size of sun.


2. The moon is the brightest object in the sky but gives off no light of its own but reflects light off the sun. Its much smaller than Earth and is only 27% of its radius. The light parts of the moon were flooded by lava when volcanoes erupted millions of years ago.

3. Milky Way Galaxy is the home of the Solar System and 200 billion other stars and their planets. Its a giant and has almost one trillion solar masses.

4.Worm holes- A hypothetical "tunnel" connecting two different points in space such a way that a trip through the wormhole could take much less time than a journey between the same starting and ending points in normal space. The ends of a wormhole could, in theory, be intra-universe.




5.Dark energy- In the context of dark energy, the cosmological constant is a reservoir which stores energy. Its energy scales as the Universe expands. Applied to the supernova data, it would distinguish effects due to the matter in the Universe from those due to the dark energy. Unfortunately, the amount of this stored energy required is far more than observed and would result in very fast acceleration. So much so that the stars and galaxies would not form.