article_snippet.sent: London (CNN)If you're hunting for the earliest galaxies and clues about potential life on other planets
article_snippet.sent: Hubble has returned spectacular images during the past quarter century but also helped scientists discover that almost every galaxy has a massive black hole at almost every galaxy heart and that the expansion of the universe is speeding up.
article_snippet.sent: NASA spokesperson Lynn Chandler told CNN that the mission was like opening up the curtains on the universe and peering inside. "
article_snippet.sent: Hubble rewrote the text books and we're planning to rewrite the text books again," NASA spokesperson Lynn Chandler said.
article_snippet.sent: Hubble is about the size of a school bus but JWST is as big as a tennis court.
article_snippet.sent: According to NASA, the mission, which is in collaboration with the European Space Agency (ESA) and the Canadian Space Agency (CSA) and involves a total of 14 countries, will cost $8.5 billion.
article_snippet.sent: NASA says that the project has four main goals -- namely, to search for the first galaxies formed after the Big Bang, find out how galaxies evolved, observe the birth of stars and planets and investigate the potential for life on other planets .
article_snippet.sent: Opinion: Why astronomy counts on Earth .
highlights_snippet.sent: Hubble has helped make major discoveries but there are limits to how far it can see into space .
  