1. How old is the universe calculated to
be (to 3 significant figures)?
Approximately
13.7 x 109 years

2. How old is the solar system
calculated to be (to 3 s.f.)?
Approximately
4.5 x 109 years

3. Stars shine in a variety of
different colours. Why?
Temperature.
Blue >>> White >>> Yellow >>> Red

4. What’s the definition of a
planet?
A body that maintains a (broadly) spherical
shape due to gravity, maintains a stable orbit
around a star and can remove other bodies
from its orbital path.

5. How do you make a star?
Find a very cold cloud of gas and dust
and disturb it gravitationally or by
radiation.

6. What’s the connection between
a star and your jewellery??
All the precious elements in your rings
are formed (and can only be formed)
when the biggest stars explode.

7. Why does the moon always how
the same side to the Earth???
Over time it’s rotation right has become
synchronised – tidally locked - to that of the
Earth. Given time all orbiting bodies perform
the same behaviour, Earth will synchronise its
rotation with the sun in about 14 billion years.