Astronomers have detailed observations of Arp 78, a peculiar galaxy in Aries situated approximately 100 million light-years away from Earth. Spanning an enormous 200,000 light-years across, the cosmic structure features a prominent, overdeveloped outer spiral arm tracked by dark dust lanes and young blue star clusters, showcasing complex gravitational forces in deep space.
What causes Arp 78's unique shape?
Arp 78, also cataloged as NGC 772, gains its overdeveloped spiral arm from galactic-scale gravitational tides. Observations indicate that these tidal forces stem from interactions with its compact elliptical companion galaxy, NGC 770, which orbits nearby and shapes the larger spiral structure.
Where is this peculiar galaxy located?
The peculiar galaxy in Aries resides far beyond the stars and nebulae of our own Milky Way. Deep telescopic exposures reveal faint surrounding star streams, highlighting the ongoing gravitational influence between the two neighboring cosmic systems.
