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Motor and sensory homunculi
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Motor and sensory homunculi
Duncan Dunbar Sail Ship
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Duncan Dunbar Sail Ship
Diagram showing the spectral class and luminosity of stars Featured Image

Diagram showing the spectral class and luminosity of stars

Diagram showing the spectral class and luminosity of stars. The diagram was named The Hertzsprung-Russell Diagram, or the H-R diagram for short. At the beginning of the 20th century two astronomers found that if stars were plotted on a diagram with their luminosity (brightness) on one axis, and their spectral class on the other, that stars formed three distinct groups. The largest group, the Main Sequence Stars, is where 90% of the stars are found. These stars are fusing hydrogen into helium in their cores. This group propagates diagonally from the upper left corner, down to the right corner. The group below the main sequence is the White Dwarfs, which is a group of small, earth-sized stellar remnants. The third group, which is found above the main sequence is that of the giants.
Stars appear on a specific place on the main sequence depending on their mass and age. The mass determines when it will leave the main sequence.The H-R diagram is a significant tool for astronomers, when it comes to understanding stellar evolution

© Fahad Sulehria/Stocktrek Images

Smiley face symbols
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Smiley face symbols
Roman memento mori mosaic
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Roman memento mori mosaic
Nuclear Fission Artwork
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Nuclear Fission Artwork
Embryonic stem cell and needle, SEM Featured Image

Embryonic stem cell and needle, SEM

Embryonic stem cell and needle. Coloured scanning electron micrograph (SEM) of an embryonic stem cell (ESC) sitting in the eye of a needle. ESCs are pluripotent, that is they are able to differentiate into any cell type. The type of cell they mature into depends upon the biochemical signals received by the immature cells. This ability makes ESCs a potential source of cells to repair damaged tissue in diseases such as Parkinson's and insulin-dependent diabetes. However, research using ESCs is controversial as it requires the destruction of an embryo

© STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Yoga and the chakras
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Yoga and the chakras
Gas mask
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Gas mask
Gaudi architecture
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Gaudi architecture
Spare kidneys
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Spare kidneys
Maze, artwork
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Maze, artwork
Quantised orbits of the planets Featured Image

Quantised orbits of the planets

Quantum orbits of the planets. Conceptual computer artwork showing the planets of the solar system on a model of atomic orbitals. This represents the theory that the orbits of the planets were determined by similar physical principles to those governing the orbits of electrons. Electrons can only occupy distinct energy levels around an atom, rather than having the capability to be anywhere. These quantum levels are determined by the electron's energy. The theory that similar effects occur at the solar system scale is controversial and not widely accepted, as the orbits can be explained by well-understood gravitational theory

© MEHAU KULYK/SCIENCE PHOTO LIBRARY

Into the Abyss
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Into the Abyss
Open Sign
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Open Sign

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