Once-wild planet may explain our unusual, sparse Solar System.
The neighbourhood of our inner Solar System wasn’t always so lonely.
Already a subscriber? Log in.
Win a prize this Mother's Day by subscribing to our annual plan now! T&C applies.
Cancel anytime. No ads. Auto-renewal. Unlimited access to the web and app. Personalised features. Members rewards.
Follow us on our official WhatsApp channel for breaking news alerts and key updates!