To be considered Earth-like, a planet must be rocky, roughly Earth-sized and orbiting Sun-like stars and should orbit in the habitable zones of its star.
Scientists have been trying to find Earth-like planets with the hope that these exoplanets might contain life and this is the first time they have found it.
The exoplanet Kepler-1658b is a massive 'hot Jupiter' that whips around its star every 3.85 days.
NASA's Kepler Space Telescope revealed that our galaxy contains more planets than stars.
Kepler's findings have given a glimpse into roughly 200,000 potentially habitable world in Earth's sky.
NASA in April launched another planet-hunting spacecraft, the Transiting Exoplanet Survey Satellite.
SpaceX halted the countdown a little more than two hours before its Falcon 9 rocket had been scheduled to carry the TESS, into orbit.
NASA's TESS spacecraft is expected to lift off from Cape Canaveral Air Force Station at 6:32 pm Eastern Time which is 4:02 am (Tuesday) in India.
The form that water would take on TRAPPIST-1 planets would depend on the amount of heat they receive from their star.
NASA will announce the discovery made by Kepler, which has been searching for alien worlds since 2009, on 14 December.
The list includes several planets that orbit stars like our Sun.
The discovery marks the first time that an object as small as a comet has been detected using transit photometry.
The findings published online in the journal Monthly Notices of the Royal Astronomical Society showed that older stars drop in activity quickly.
The repeating pattern of transits used to discover the planets in the TRAPPIST-1 system has been translated into a melody.
The latest release brings up the total planet candidates identified by Kepler to 4,034, out of which 2,335 have been verified as exoplanets.
Previously, the star had experienced sudden dimming events in 2011 and 2013, which were observed by Nasa's Kepler mission.
The planets are locked in an orbital resonance, each gravitationally tugging the next planet, and keeping it in place.
A hypothetical Earth sized rocky planet at just the right distance from a pair of stars can retain liquid water on its surface for long durations of time.
Nasa has now made the unprocessed data from a sustained observation campaign of the Trappist-1 system by Kepler available to the scientific community.
ANU researchers have found out that planetary systems around distant stars are shaped like our own solar system.