PIX4639821: Artist's view of a first human crew on Mars - Martian Pioneers - The first human visitors to Mars would face an environment nearly as hostile as the Earth's Moon. While Mars has an atmosphere, it contains no breathable oxygen and is so thin that the surface air pressure is about the same as the Earth's 18 miles above sea level. To venture outside, humans would need hardy suits that would supply pressure, oxygen, moisture, warmth, and insulate them from the fine martian dust that may be both abrasive and caustic. Even with these precautions, humans would still be vulnerable to radiation from solar storms and the continual rain of interstellar cosmic rays / Bridgeman Images
PIX4642714: View of satellites and debris in low orbit around the Earth - Objects in low - Earth orbit - View over Ecuador 80 per cent of recenses are in low orbit up to 2000 km above Earth. Objects in low - Earth orbit (LEO). View over the equator. Eighty percent of all catalogued objects are in low - Earth orbit (LEO), which extends to 2000 km above the Earth's surface. To observe the Earth, spacecraft must orbit at such a low altitude. The spatial density of objects increases at high latitudes / Bridgeman Images
PIX4650277: Johannes Kepler - Contemporary illustration. Kepler Johannes (Weil 1571 - Regensburg 1630) German Astronomer. Johannes Kepler (Dec 27 1571 - Nov 15 1630) was a german mathematician, astronomer and a key figure in the 17th century astronomical revolution. Modern illustration / Bridgeman Images
PIX4668007: Chateau du Clos Luce - Clos Luce - Amboise - The Chateau du Clos Luce is located in the heart of the Loire Valley, in the city center of Amboise. Once called the Chateau du Cloux and summer residence of the kings of France until 1516, Francois I put it at the disposal of Leonard de Vinci, who lived there for three years, until his death on 2 May 1519 / Bridgeman Images