I read this book many years ago and it had a nice plot. For the life of me I can't remember the name or author so I need help.
Story: one asteroid shaped object appears close to Earth orbit or in the Sol system.
People get on board and start exploring. They find machines/computers that can teach them anything in a very short time (languages, crafts etc).
Towards the end, something happens and one of the characters goes into a long tunnel where he/she opens a portal in time with the help of a device he/she has.
In the epilogue it states that he has been transported back in time to Egypt. I think there were no pyramids.
Sorry for being brief but this is all I remember. Any help would be appreciated. Thanks.