What is Einstein's Cross?
Q: What is Einstein's Cross?
A: Einstein's Cross is an image of a quasar that is 8,000,000,000 light years away.
Q: How far away is ZW 2237+030, the lensing galaxy, from Earth?
A: ZW 2237+030, the lensing galaxy, is only 400 million light years away from Earth.
Q: How many images of the same distant quasar appear around the foreground galaxy due to strong gravitational lensing?
A: Four images of the same distant quasar appear around the foreground galaxy due to strong gravitational lensing.
Q: Why do amateur astronomers need extremely dark skies and large telescope mirrors to see Einstein's Cross?
A: Amateur astronomers need extremely dark skies and large telescope mirrors with diameters of 18 inches or greater to see Einstein's Cross because it is located 8 billion light years away.
Q: What is the significance of the quasar's redshift?
A: The quasar's redshift determines that it is located about 8 billion light years away from Earth.
Q: What is the name of the lensing galaxy?
A: The name of the lensing galaxy is ZW 2237+030, also known as Huchra's lens.
Q: How many parsecs away is Einstein's Cross?
A: Einstein's Cross is 2,500,000,000 parsecs away.
