5 TOP FACTS GRAVITY
- Black hole – A black hole’s gravitational pull
is so strong that even light can’t escape from what’s known as its
‘event horizon’, an invisible boundary around it.
- Mighty moon The moon’s low gravity means objects weigh one sixth of their Earth weight. A strong man could lift a small car on the moon!
- Escape velocity
Deimos, a moon of Mars, has such low gravity that if you jumped, you’d
easily achieve escape velocity and send yourself into space.
- Gravity and fitness
Prolonged exposure to zero gravity poses health risk for astronauts,
including bone loss, muscle atrophy and even immune problems.
- Pulling power
Size and mass effect gravity: Uranus has 14.5 times the mass of Earth
but because of its size, it only has around 90 per cent of Earth’s
gravity.