The closest distance from which an asteroid has been photographed using ground-based radar is 2. 2 million miles, the distance from which the asteroid Toutatis was recently photographed. The closest photograph of an asteroid is of Gaspra, which was photographed from a distance of only 10, 000 miles. Which of the following can be properly concluded from the statements above? ['Ground-based radar photography cannot take photographs of objects much beyond 2. 2 million miles from Earth.', 'The photograph of Gaspra was not taken using ground-based radar.', 'Toutatis, unlike Gaspra, has only recently been discovered.', 'Toutatis is more likely to collide with the Earth than Gaspra is.']