a据说这本书已经被翻译成好几种语言 It is said this book already is translated several languages[translate] ai dont want you to get fat 我不要您胖[translate] a谁伴我闯荡 Who accompanies my wanderer[translate] a地球的直径是多少? How many is Earth's diameter?[translate]...
Because of the discrepancy between Earth’s polar and equatorial diameter, astronomers and scientists often employ averages. This is what is known as its “mean diameter”, which in Earth’s case is the sum of its polar and equatorial diameters, which is then divided in half. From this, we...
The surface area of the Earth, given a diameter of 6,000 miles, is approximately 36,000,000π square miles or 1.131 * 10^8 square miles. 1. Find the radius: The diameter is twice the radius, so the radius of the Earth is 6000 miles / 2 = 3000 miles. 2. Apply the formula fo...
When the moon moves completely into the Earth's dark shadow cone (called the "umbra") we call that a total lunar eclipse. At the moon's average distance from Earth of 239,000 miles [383,000 km], the umbra measures roughly 5,800 miles [9,334 km] in diameter. The moon is about 2...
11, Mars will still be an impressive sight in backyard telescopes for some time, showing an apparent disk diameter of 14.55 arc-seconds. (In comparison, Jupiter's disk spans about 42 arc-seconds.) Mars' Earth-facing hemisphere on Jan. 15 will display its bright northern polar cap — ...
01What is mining tooth wheel drilling tool Mining tooth wheel drilling tools are mainly used for vertical perforation operations in large open-pit mines, earth and rock drilling, water wells and geothermal wells. During the drilling process, the tooth wheel drilling machine drives the rotary motion...
Elon Musk has made a lot of predictions about Mars, including that we could have thebeginnings of a human colony this decade. Musk envisions a fleet of more than 100 Starships, gathering in orbit of Earth to depart en masse for Mars every 26 months when the planet is closest. Each of ...
Which is the best telescope to view galaxies? Because most galaxies appear small and dim from our vantage point on Earth, telescopes with larger apertures are recommended because they collect more light. Newtonian reflectors are a great choice for those on a budget and can pull in some tremendo...
(but not hit) Earth on April 13, 2029. NASA’s OSIRIS-REx spacecraft, the one that dropped off samples of the asteroid Bennu last year, is still in space and will rendezvous with Apophis after it passes Earth, but scientists also want to collect data before it gets here. That way ...
making them incredibly dense. This means that their gravitational pull is immense, for example, on the surface of a neutron star gravity is around 1 billion times stronger than its pull on Earth. This makes neutron stars a great test subject to challenge predictions in Einstein's theories, suc...