Most asteroids lie in a vast ring between the orbits of Mars and Jupiter. This main asteroid belt holds more than 200 asteroids larger than 60 miles (100 kilometers) in diameter.hey are also known as planetoids or minor planets. In total, the mass of all the asteroids is less than that of Earth's moon. But despite their size, asteroids can be dangerous. Many have hit Earth in the past, and more will crash into our planet in the future.
Heathrow Express. Heathrow Express is an airport rail link between London Heathrow Airport and Paddington. It opened in 1998 and is operated by the Heathrow Express Operating Company, a wholly owned subsidiary of Heathrow Airport Holdings. It is an open access operator and not subject to franchising.
Monday-Friday, the station is only served by the ' Heathrow Express shuttle' service which provides a train every 15 minutes between Terminal 4 and Heathrow Central.ransport for London Travelcards are not valid on services from the Heathrow Express station, though the tube station is in Travelcard Zone 6. Heathrow Central and Terminal 4 National Rail stations are outside the Travelcard zonal area.