More from BBC Sky at Night

BBC Sky at Night5 min read
Sky-Watcher EQ-AL55i Pro Wi-Fi mount
∙ Price £779 ∙ Mount type Equatorial with Go-To ∙ Load capacity 10kg ∙ Slew speed Up to 4° per second ∙ Power input 12V DC ∙ Autoguider port ST4 ∙ Protocols SynScan, ASCOM via Wi-Fi or USB ∙ Weight 14.8kg ∙ Supplier Optical Vision Ltd ∙ Email info@op
BBC Sky at Night3 min read
The Planets
PICK OF THE MONTH Best time to see: 30 June, 03:50 BST (02:50 UT) Altitude: 15° Location: Aries Direction: East Features: Surface markings, weather Recommended equipment: 150mm scope or larger Mars is a mag. +1.0 morning object at the start of June,
BBC Sky at Night1 min read
Travel Restrictions
You would expect that extremely energetic particles are hard to stop, but no. If a high-energy proton or electron collides with an atomic nucleus in Earth's atmosphere (or in interstellar space), the collision energy is converted into a whole load of