Evidence for 'Planet Nine' lurking on the fringes of the Solar System is building. So why can't astronomers spot it?

Summary

1. Probability of these orbits occurring by chance- one in a million.
2. May be up to 10 times Earth’s mass or a small Black Hole.
3. Indirect evidence only to date.
4. A new telescope may soon confirm or refute its existence.

References

• Media Check: ABC News Australian Broadcasting Corporation - Media Bias Fact Check (High Credibility)
• Collections |The Runway (airforce.gov.au)
• RAAF RUNWAY: RATIONALE, GUIDELINES, LEARNING OUTCOMES, ETC