(LONDON GUARDIAN) Name: (101429) 1998 VF31 (AKA: the Moon’s Sister).
Age: 4.5bn years, give or take.
Appearance: Lunar.
Twinned with: The moon.
I didn’t realise the moon had any siblings. No one did. This one, an asteroid about 1km in diameter, has been hiding behind Mars the whole time.
And how is it related to the moon? They appear to be made of the same stuff.
How would anyone know that? Spectroscopic observation.
What does that mean?
